Question: what is the surface area of the lagoon southwest of Dreverna

full_context: Document 1: River Glaven: The River Glaven in the eastern English county of Norfolk is 10½ miles long and flows through picturesque North Norfolk countryside to the North Sea. Rising from a tiny headwater in Bodham the river starts 2½ miles before Selbrigg Pond where three streams combine at the outfall. The scenic value of the Glaven valley is important to the tourist industry in North Norfolk.
Document 2: Drever: The Drever is a breed of dog, a short-legged scenthound from Sweden used for hunting deer and other game. The Drever is descended from the Westphalian Dachsbracke, a type of German hound called "Bracke". The breed name Drever was chosen through a contest in 1947.
Document 3: Welney: Welney is a village and civil parish in the Fens of England, and the county of Norfolk. The village is situated immediately to the west of the Old Bedford River, River Delph and New Bedford River, which are all parallel channels and are here crossed by the A1101 road. The village is some 15 km south-west of the town of Downham Market, 30 km south of the town of King's Lynn and 70 km west of the city of Norwich. The county boundary with Cambridgeshire is adjacent, and the city of Cambridge lies 40 km to the south.
Document 4: Baltic Sea: The Baltic Sea is a sea of the Atlantic Ocean, enclosed by Scandinavia, Finland, the Baltic countries, and the North and Central European Plain. It includes the Gulf of Bothnia, the Bay of Bothnia, the Gulf of Finland, the Gulf of Riga, and the Bay of Gdańsk. The sea stretches from 53°N to 66°N latitude and from 10°E to 30°E longitude. A mediterranean sea of the Atlantic, with limited water exchange between the two bodies, the Baltic Sea drains through the Danish islands into the Kattegat by way of the straits of Øresund, the Great Belt, and the Little Belt.
Document 5: Līva: Līva (German: "Lyva, Lyua, Libau" ) was a famous river in Kurzeme in today's Latvia. It was located between the Baltic Sea and Liepāja Lake and had a length of about 6 kilometres and a width near the mouth of about 50 metres. The source of the Līva was located in Liepāja Lake near the former Pērkone river. The place where the Līva fell into the Baltic Sea was located approximately at the site of today's northern harbour in Liepāja. The river had one known island, Perkunen (Latvian: "Pērkona galva" ); it was located near the source of the river. The Līva served as a water trade way to Grobiņa via the Liepāja lake and the port was located on it. The original suburb with a name Līva was located about 1 kilometre from the mouth of the river on both sides of it. The old name for the city Liepāja descends from the name of the river and for the centuries was associated with it. The part of the river near the mouth had become too shallow by the end of the 15th century. In the 16th century, the first Līva channel was dug up between Līva and Baltic Sea with a length of about 780 metres and a width of 50 metres. In 1697–1703, the new Trade channel was dug up and few years later the river was filled up.
Document 6: Curonian Lagoon: The Curonian Lagoon (or Bay, Gulf; Russian: "Куршский залив" , Lithuanian: "Kuršių marios" , Polish: "Zalew Kuroński" , German: "Kurisches Haff" , Latvian: "Kuršu joma" ) is separated from the Baltic Sea by the Curonian Spit. Its surface area is 1,619 km2 . The Neman River (Lithuanian: "Nemunas" ) supplies about 90% of its inflows; its watershed consists of about 100,450 square kilometres in Lithuania and Russia's Kaliningrad Oblast.
Document 7: Sea of Azov: The Sea of Azov (Russian: Азо́вское мо́ре, "Azovskoye more" ; Ukrainian: Азо́вське мо́ре , "Azovs'ke more/Azovśke more"; Crimean Tatar: Azaq deñizi, "Азакъ денъизи", ازاق دﻩﯕىزى ) is a sea in Eastern Europe. To the south it is linked by the narrow (about 4 km ) Strait of Kerch to the Black Sea, and it is sometimes regarded as a northern extension of the Black Sea. The sea is bounded in the north by mainland Ukraine, in the east by Russia, and in the west by the Crimean Peninsula. The Don and Kuban are the major rivers that flow into it. The Sea of Azov is the shallowest sea in the world, with the depth varying between 0.9 and . There is a constant outflow of water from the Sea of Azov to the Black Sea.
Document 8: Vecate Parish: Vecate parish (Latvian: "Vecates pagasts" ) is an administrative unit of the Burtnieki Municipality, Latvia - located in northern Latvia, south of the town of Mazsalaca, near the river Salaca and Lake Burtnieks which is fourth largest lake in Latvia. The area covers 8974 ha and population is approx 564. One of the most outstanding European Stone Age settlements such as Fishermen Archaeological Complex "Zvejnieki" (contains settlement and the cemetery), ancient settlement "Kaulenkalns" (archaeological excavations by E.Sturm in 1943. - 1944.) and "Rinnukalns" (archaeological excavations by Carl Georg von Sievers in 1875. - 1877.; A.Zommers in 1881. and E. Sturm in 1943.) are located in this area. Vecate parish developed around the former Alt-Ottenhof manor and it was first mentioned in historical sources in 1640. The area benefits from the local boathouse, library with free public WiFi access, doctorate, open-air stage with sports facilities, newly build community centre and a local shop. "Vecate" boathouse has been very popular to anglers and hunters for many years and provides a hire of rowing / fishing boats, also anglers can purchase local fishing licences for legal fishing in the river and lake.
Document 9: Brule Glacial Spillway State Natural Area: Brule Glacial Spillway is a Wisconsin Department of Natural Resources-designated State Natural Area that encompasses the valley of the upper reaches of the Bois Brule River. This valley was carved by the outlet of Glacial Lake Duluth, which occupied what is now the western portion of Lake Superior, during the retreat of the Superior lobe of Wisconsin glaciation. This outlet flowed southwestward through the valley, to what is now the St. Croix River. As the glacier melted, and the level of Lake Superior dropped, the direction of flow shifted to its present northeastward course, towards Lake Superior. A high point in a vast bog near Solon Springs marks the divide between the watersheds of the Gulf of Mexico and the Atlantic Ocean. This divide was used for thousands of years, by Native Americans, European explorers, fur traders, and settlers as a portage between the two watersheds.
Document 10: Zuiderzee: The Zuiderzee (] ; old spelling "Zuyderzee") was a shallow bay of the North Sea in the northwest of the Netherlands, extending about 100 km (60 miles) inland and at most 50 km (30 miles) wide, with an overall depth of about 4 to 5 metres (13–16 feet) and a coastline of about 300 km (200 miles). It covered 5,000 km2 . Its name means "southern sea" in Dutch, indicating that the name originates in Friesland, to the north of the Zuiderzee (cf. North Sea). In the 20th century the majority of the Zuiderzee was closed off from the North Sea by the construction of the Afsluitdijk, leaving the mouth of the inlet to become part of the Wadden Sea. The salt water inlet changed into a fresh water lake now called the IJsselmeer (IJssel Lake) after the river that drains into it, and by means of drainage and polders, an area of some 1500 km2 was reclaimed as land. This land eventually became the province of Flevoland, with a population of nearly 400,000 (2011).
Document 11: Dreverna: Dreverna is a village located in the Klaipėda County, on the Dreverna river, southwest of the village is the Curonian Lagoon.
Document 12: Šventoji, Lithuania: Šventoji is a small resort town on the coast of the Baltic Sea in Lithuania. Administratively it is part of Palanga city. The total population of Šventoji as of 2012 was 2631. The town is located about 12 km north of Palanga center and close to the border with Latvia. Further north of the town is Būtingė and its oil terminal. Šventoji River flows into the Baltic sea at the town. The town also has a famous lighthouse, which is located 780 meters from the sea. Its height is 39 meters. The town is a popular summer resort for families, during summer it has many cafes, restaurants and various attractions for the visitors.
Document 13: Kaunas Reservoir: Kaunas Reservoir (Lithuanian: "Kauno marios" ) is the largest Lithuanian artificial lake, created in 1959 by damming the Nemunas River near Kaunas and Rumšiškės. It occupies 63.5 square kilometers, which is about 0.1% of the total territory of Lithuania. The reservoir supports the operations of the Kaunas Hydroelectric Power Plant. Its waters cover the Nemunas valley from the river's confluence with Strėva River to the dam, a distance of about 25 kilometers. The greatest width of the reservoir is 3.3 kilometers and its greatest depth is 22 meters.
Document 14: Dovray Township, Murray County, Minnesota: Dovray Township is a township in Murray County, Minnesota, United States. The population was 167 at the 2000 census. Dovray is located in Southwest Minnesota on the eastern side of Murray County. It is five minutes from Currie, Minnesota, fifteen minutes from Lake Shetek State Park, and it is twenty minutes northeast of Slayton, Minnesota.
Document 15: Kandalaksha Nature Reserve: Kandalaksha Nature Reserve (Russian: Кандалакшский заповедник ) (also Kandalakshsky) is a Russian 'zapovednik' (strict ecological reserve) on the south shore of Kandalaksha Bay in the Murmansk and Karelia regions on the opening to the White Sea. The reserve also includes two small sectors on the northern coast of the Kola peninsula on the Barents Sea; notably, the warm Atlantic current causes the northern sectors on the Barents Sea to be warmer than the more southerly White Sea sectors. Over 550 islands are covered in the boundaries of the reserve. It is one of the oldest nature reserves in Russia, created in 1932 to protect the marine habitats and waterfowl of the region, particularly the eider. The reserve is situated in the Kandalakshsky District, Kolsky District, and Lovozersky District of Murmansk Oblast. The nearest city, Kandalaksha, is at the northwest entrance to the Kandalaksha Gulf, about 5 km from the nearest point in the reserve. Since 1976, the reserve has been part of the RAMSAR wetland site of international importance "Kandalaksha Bay". It covers an area of 70530 ha .
ground_truth: 1,619 km2