Information: - Thessaloniki is the second-largest city in Greece and the capital of Greek Macedonia, the administrative region of Central Macedonia and the Decentralized Administration of Macedonia and Thrace. Its nickname is ("Symprotevousa"), literally "the co-capital", a reference to its historical status as the ("Symvasilevousa") or "co-reigning" city of the Eastern Roman (Byzantine) Empire, alongside Constantinople. - The Saronic Islands or Argo-Saronic Islands is an archipelago in Greece, named after the Saronic Gulf in which they are located, just off the Greek mainland. The main inhabited islands of this group are Salamis (where the ancient Greek navy defeated the Persians in the Battle of Salamis), Aegina, Agistri, and Poros. The islands of Hydra and Dokos, which lie off the northeast tip of the Peloponnese (technically between the Saronic Gulf and the Argolic Gulf), are sometimes included as part of the Saronic Islands. - The Isthmus of Corinth is the narrow land bridge which connects the Peloponnese peninsula with the rest of the mainland of Greece, near the city of Corinth. The word "isthmus" comes from the Ancient Greek word for "neck" and refers to the narrowness of the land. The Isthmus was known in the ancient world as the landmark separating the Peloponnese from mainland Greece. In the first century CE the geographer Strabo noted a stele on the Isthmus of Corinth, which bore two inscriptions. One towards the East, i.e. towards Megara, reading: ""Here is not Peloponnesus, but Ionia"" and the one towards the West, i.e. towards the Peloponnese: ""Here is Peloponnesus, not Ionia""; Plutarch ascribed the erection of the stele to the Attic hero Theseus, on his way to Athens. - The euro (sign: ; code: EUR) is the official currency of the eurozone, which consists of 19 of the member states of the European Union: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia, and Spain. The currency is also officially used by the institutions of the European Union and four other European countries, as well as unilaterally by two others, and is consequently used daily by some 337million Europeans . Outside of Europe, a number of overseas territories of EU members also use the euro as their currency. - Poros is a small Greek island-pair in the southern part of the Saronic Gulf, about (31 nautical miles) south from Piraeus and separated from the Peloponnese by a wide sea channel, with the town of Galatas on the mainland across the strait. Its surface area is about and it has 3,780 inhabitants. The ancient name of Poros was Pogon. Like other ports in the Saronic, it is a popular weekend destination for Athenian travellers. - Aegina ("Aigina" ) is one of the Saronic Islands of Greece in the Saronic Gulf, from Athens. Tradition derives the name from Aegina the mother of the hero Aeacus, who was born on the island and became its king. During ancient times Aegina was a rival of Athens, the great sea power of the era. - Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean Sea to the south. To the east and southeast, Europe is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways of the Turkish Straits. Yet the non-oceanic borders of Europea concept dating back to classical antiquityare arbitrary. The primarily physiographic term "continent" as applied to Europe also incorporates cultural and political elements whose discontinuities are not always reflected by the continent's current overland boundaries. - TheMediterranean Sea (pronounced ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The sea is sometimes considered a part of the Atlantic Ocean, although it is usually identified as a separate body of water. - Greece (' ), officially the Hellenic Republic (Greek: ' ), historically also known as Hellas ("" ), is a country in southeastern Europe. Greece's population is approximately 10.955 million as of 2015. Athens is the nation's capital and largest city, followed by Thessaloniki. - Nafplio is a seaport town in the Peloponnese in Greece that has expanded up the hillsides near the north end of the Argolic Gulf. The town was an important seaport held under a succession of royal houses in the Middle Ages as part of the lordship of Argos and Nauplia, held initially by the de la Roche following the Fourth Crusade before coming under the Republic of Venice and, lastly, the Ottoman Empire. The town was the capital of the First Hellenic Republic and of the Kingdom of Greece, from the start of the Greek Revolution in 1821 until 1834. Nafplio is now the capital of the regional unit of Argolis. - The Corinth Canal ("Dhioryga tis Korinthou") is a canal that connects the Gulf of Corinth with the Saronic Gulf in the Aegean Sea. It cuts through the narrow Isthmus of Corinth and separates the Peloponnese from the Greek mainland, thus effectively making the former peninsula an island. The builders dug the canal through the Isthmus at sea level; no locks are employed. It is in length and only wide at its base, making it impassable for most modern ships. It now has little economic importance. - The Dardanelles, also known in Classical Antiquity as the Hellespont ("Hellespontos", literally "Sea of Helle"), is a narrow, natural strait and internationally-significant waterway in northwestern Turkey that forms part of the continental boundary between Europe and Asia, and separates Asian Turkey from European Turkey. One of the world's narrowest straits used for international navigation, the Dardanelles connects the Sea of Marmara with the Aegean and Mediterranean Seas, while also allowing passage to the Black Sea by extension via the Bosphorus. - Spetses (Modern Greek: , Katharevousa: , "Spetsai", Ancient: , "Pityoussa") is an affluent island and a municipality in the Islands regional unit, Attica, Greece. It is sometimes included as one of the Saronic Islands. Until 1948, it was part of the old prefecture of Argolidocorinthia, which is now split into Argolis and Corinthia. In ancient times, it was known as Pityoussa, and later as Petses. - An archipelago, sometimes called an island group or island chain, is a chain, cluster or collection of islands. The word "archipelago" is derived from the Greek "- arkhi-" ("chief") and " pelagos" ("sea") through the Italian "arcipelago". In Italian, possibly following a tradition of antiquity, the Archipelago (from medieval Greek "*" and Latin "archipelagus") was the proper name for the Aegean Sea and, later, usage shifted to refer to the Aegean Islands (since the sea is remarkable for its large number of islands). It is now used to refer to any island group or, sometimes, to a sea containing a small number of scattered islands. - Hydra ( Greek : , pronounced ( ira ) in modern Greek ) is one of the Saronic Islands of Greece , located in the Aegean Sea between the Saronic Gulf and the Argolic Gulf . It is separated from the Peloponnese by a narrow strip of water . In ancient times , the island was known as Hydrea ( , derived from the Greek word for '' water '' ) , a reference to the springs on the island . The municipality of Hydra consists of the islands Hydra ( area 52 km2 ( 20.1 sq mi ) ) , Dokos ( pop. 18 , area 13.5 km2 ( 5.2 sq mi ) ) , and a few uninhabited islets . The province of Hydra ( Greek : ) was one of the provinces of the Piraeus Prefecture . Its territory corresponded with that of the current municipality . It was abolished in 2006 . There is one main town , known simply as '' Hydra port '' ( pop. 1,900 in 2011 ) . It consists of a crescent - shaped harbor , around which is centered a strand of restaurants , shops , markets , and galleries that cater to tourists and locals ( Hydriots ) . Steep stone streets lead up and outward from the harbor area . Most of the local residences , as well as the hostelries on the island , are located on these streets . Other small villages or hamlets on the island include Mandraki ( pop. 11 ) , Kamini , Vlychos ( 19 ) , Palamidas , Episkopi , and Molos . - The Aegean Islands (transliterated: "Nisia Aigaiou") are the group of islands in the Aegean Sea, with mainland Greece to the west and north and Turkey to the east; the island of Crete delimits the sea to the south, those of Rhodes, Karpathos and Kasos to the southeast. The ancient Greek name of the Aegean Sea, "Archipelago" ("archipelagos") was later applied to the islands it contains and is now used more generally, to refer to any island group. - Athens ("Athina" ) is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, with its recorded history spanning over 3,400 years, and its earliest human presence starting somewhere between the 11th and 7th millennia BC. Classical Athens was a powerful city-state that emerged in conjunction with the seagoing development of the port of Piraeus, which had been a distinct city prior to its 5th century BC incorporation with Athens. A centre for the arts, learning and philosophy, home of Plato's Academy and Aristotle's Lyceum, it is widely referred to as the cradle of Western civilization and the birthplace of democracy, largely because of its cultural and political impact on the European continent, and in particular the Romans. In modern times, Athens is a large cosmopolitan metropolis and central to economic, financial, industrial, maritime, political and cultural life in Greece. In 2015, Athens was ranked the world's 29th richest city by purchasing power and the 67th most expensive in a UBS study. - Anatolia (from Greek , ' "east" or "(sun)rise"; in modern ), in geography known as Asia Minor (from ' "small Asia"; in modern ), Asian Turkey, Anatolian peninsula, or Anatolian plateau, is the westernmost protrusion of Asia, which makes up the majority of modern-day Turkey. The region is bounded by the Black Sea to the north, the Mediterranean Sea to the south, and the Aegean Sea to the west. The Sea of Marmara forms a connection between the Black and Aegean Seas through the Bosphorus and Dardanelles straits and separates Anatolia from Thrace on the European mainland. - Argolis or the Argolid ("Argolida", ; "Argolis" in ancient Greek and Katharevousa) is one of the regional units of Greece. It is part of the region of Peloponnese, situated in the eastern part of the Peloponnese peninsula and part of the tripoint area of Argolis, Arcadia and Corinthia. Much of the territory of this region is situated in the Argolid Peninsula. - The Saronic Gulf (Greek: , "Saronikos kolpos") or Gulf of Aegina in Greece forms part of the Aegean Sea and defines the eastern side of the isthmus of Corinth. It is the eastern terminus of the Corinth Canal, which cuts across the isthmus. - The Aegean Sea is an elongated embayment of the Mediterranean Sea located between the Greek and Anatolian peninsulas, i.e., between the mainlands of Greece and Turkey. In the north, it is connected to the Marmara Sea and Black Sea by the Dardanelles and Bosphorus. The Aegean Islands are within the sea and some bound it on its southern periphery, including Crete and Rhodes. - Agistri, also Angistri or Agkistri (Greek: , English: "fishing hook"), is a small island and municipality in the Saronic Gulf in the Islands regional unit, Greece. - The Argolic Gulf (also "Gulf of Argolis" or "Gulf of Nafplio") is a gulf of the Aegean Sea off the east coast of the Peloponnese, Greece. It is about 50km long and 30km wide. Its main port is Nafplio, at its northwestern end. At the entrance to the gulf is the island Spetses. This gulf and its islands are sometimes combined with the Saronic Gulf and Saronic Islands, with the result called the Argo-Saronic Gulf and the Argo-Saronic Islands. It is surrounded by two regional units: Arcadia to the southwest and Argolis to the north and east. The river Inachos drains into the Argolic Gulf near Nea Kios. The main islands in the gulf are Psili, Plateia and Bourtzi, a small island with a Venetian fortress that protects the port of Nafplio. The surrounding mountains protect it from the strong summer Meltemi wind. - The Bosphorus (or ) or Bosporus ("Bosporos" ) is a narrow, natural strait and an internationally significant waterway located in northwestern Turkey. It forms part of the continental boundary between Europe and Asia, and separates Asian Turkey from European Turkey. The world's narrowest strait used for international navigation, the Bosphorus connects the Black Sea with the Sea of Marmara, and, by extension via the Dardanelles, the Aegean and Mediterranean Seas. - Dokos is a small Greek island of the Argo-Saronic Gulf, adjacent to Hydra, and separated from the Peloponnese by a narrow strait called on some maps "the Hydra Gulf." It is part of the municipality of Ydra (Hydra) in Islands regional unit and reported a population of 18 persons at the 2011 census. The island is populated only by some Orthodox monks and perennial sheep herders. The island is rocky reaching a height of 308 metres. - Turkey, officially the Republic of Turkey (Turkish: ), is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe. Turkey is a democratic, secular, unitary, parliamentary republic with a diverse cultural heritage. Turkey is bordered by eight countries: Greece to the west; Bulgaria to the northwest; Georgia to the northeast; Armenia, the Azerbaijani exclave of Nakhchivan and Iran to the east; and Iraq and Syria to the south. The Aegean Sea is to the west, the Black Sea to the north, and the Mediterranean Sea to the south. The Bosphorus, the Sea of Marmara, and the Dardanelles, which together form the Turkish Straits, divide Thrace and Anatolia; they also separate Europe and Asia. Turkey's location has given it geopolitical and strategic importance throughout history. - Argo-Saronic Gulf is a term sometimes used to combine the adjacent Saronic Gulf and Argolic Gulf of Greece. It contains the Argo-Saronic Islands. - Aegea is a back-formation from "Aegean", the sea that was named after an eponymous Aegeus in early levels of Greek mythology. The "Encyclopaedia Britannica" (1911) mentioned an Aegea, queen of the Amazons, as an alternative eponym of the Aegean Sea. Legend says she commanded an army of Amazon women warriors that traveled from Libya to Asia Minor to fight at Troy, and that she perished at sea with her army. - Nea Kios, is a village and former municipality in Argolis, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Argos-Mykines, of which it is a municipal unit. The municipal unit has an area of 5.700 km. It was founded by refugees from Cius in Bithynia after the expulsion of the Greeks from Asia Minor. - The Peloponnese or Peloponnesus ("Peloponnsos"), is a peninsula and geographic region in southern Greece. It is separated from the central part of the country by the Gulf of Corinth. During the late Middle Ages and the Ottoman era, the peninsula was known as the Morea, a name still in colloquial use in its demotic form (). - Crete ("" ; Ancient Greek: , "Krt") is the largest and most populous of the Greek islands, 88th-largest island in the world and the fifth-largest island in the Mediterranean Sea, after Sicily, Sardinia, Cyprus, and Corsica. Crete and a number of surrounding islands and islets constitute the region of Crete, one of the 13 top-level administrative units of Greece. The capital and the largest city is Heraklion. , the region had a population of 623,065. - The Black Sea is a body of water between Eastern Europe and Western Asia, bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. It is supplied by a number of major rivers, such as the Danube, Dnieper, Rioni, Southern Bug, and Dniester. The Black Sea has an area of (not including the Sea of Azov), a maximum depth of , and a volume of . It is constrained by the Pontic Mountains to the south and by the Caucasus Mountains to the east, and features a wide shelf to the northwest. The longest east-west extent is about . - The Battle of Salamis ("Naumachia ts Salaminos") was a naval battle fought between an alliance of Greek city-states under Themistocles and the Persian Empire under King Xerxes in 480 BC which resulted in a decisive victory for the outnumbered Greeks. The battle was fought in the straits between the mainland and Salamis, an island in the Saronic Gulf near Athens, and marked the high-point of the second Persian invasion of Greece. - Arcadia ("Arkadia") is one of the regional units of Greece. It is part of the administrative region of Peloponnese. It is situated in the central and eastern part of the Peloponnese peninsula. It takes its name from the mythological character Arcas. In Greek mythology, it was the home of the god Pan. In European Renaissance arts, Arcadia was celebrated as an unspoiled, harmonious wilderness. - In the history of Europe, the Middle Ages or medieval period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance and the Age of Discovery. The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period. The medieval period is itself subdivided into the Early, High, and Late Middle Ages. - The Morea (or , , ) was the name of the Peloponnese peninsula in southern Greece during the Middle Ages and the early modern period. The name was used for the Byzantine province known as the Despotate of the Morea, by the Ottoman Empire for the Morea Eyalet, and by the Republic of Venice for the short-lived Kingdom of the Morea. - Corinth ("Korinthos") is a city and former municipality in Corinthia, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality of Corinth, of which it is the seat and a municipal unit. It is the capital of Corinthia. - The Gulf of Corinth or the Corinthian Gulf ("Korinthiaks Klpos") is a deep inlet of the Ionian Sea separating the Peloponnese from western mainland Greece. It is bounded in the east by the Isthmus of Corinth which includes the shipping-designed Corinth Canal and in the west by the Strait of Rion which widens into the shorter Gulf of Patras (part of the Ionian Sea) and of which the narrowest point is crossed since 2004 by the Rio-Antirio Bridge. The gulf is bordered by the large administrative divisions (prefectures): Aetolia-Acarnania and Phocis in the north, Boeotia in the northeast, Attica in the east, Corinthia in the southeast and south and Achaea in the southwest. The gulf is in tectonic movement comparable to movement in parts of Iceland and Turkey, growing by per year. Given the paragraphs above, decide what entity has the relation 'located in the administrative territorial entity' with 'attica'.
A:
hydra