Question: What sea lies east of the mainland of the country containing one of the oldest known surviving buildings , Theopetra cave ?

text: List of oldest known surviving buildings
Miscellaneous -- Other structures
The following are very old human constructions that do not fit the above criteria for a building , typically because they are ruins that no longer fit the height requirement specified above or for which the only significant above-ground elements are single large stones .
This article lists the oldest known surviving free-standing buildings constructed in the world, including on each of the continents and within each country. Building is defined as any human-made structure used or interface for supporting or sheltering any use or continuous occupancy. In order to qualify for this list a structure must:
Building Location First Built Use Notes
Theopetra cave Greece 21000 BC Stone wall The oldest known human-made structure . The structure is a stone wall that blocked two-thirds of the entrance to the Theopetra cave near Kalambaka on the north edge of the Thessalian plain . It was constructed 23,000 years ago , probably as a barrier to cold winds
Tell Qaramel Syria 11000-9670 BC Towers/Village The oldest known tower structure
Göbekli Tepe Turkey 9500-8400 BC Ceremonial The oldest known human-made religious structure
Tower of Jericho Palestinian territories 8000 BC Defensive/agricultural See also Wall of Jericho
Çatalhöyük Turkey 7400-6200 BC Village ruins
Khirokitia Cyprus 5800-3000 BC Houses Site has reconstructions of round houses
Durankulak Bulgaria 5500-5000 BC Neolithic settlement The excavations of the Paleolithic and Neolithic settlement on the Big Island in Bulgaria 's Durankulak Lake first started in 1974 . They discovered Paleolithic finds dating back to around 10,000 BC ; and a Neolithic settlement dating back to between 5500-5400 BC and 5100-5000 BC . The settlement , which created what is said to be Europe 's first stone city
Perperikon Bulgaria 5000 BC Ancient architectural complex Perperikon is the largest megalith ensemble in the Balkans . Human activity in the area dates back to 5000 B.C . The first traces of civilization on the hill date from the Bronze Age , while the ceramics found on the place date from the Early Iron Age , as well as the impressive round altar , almost 2 m in diameter , hewn out of the rocks . At Perperikon , a twelve days ' journey from the sea , Medokos called himself king of Thrace after Sitalces 's death in 424 BC , but failed to hold a throne
Les Fouaillages Guernsey 4500 BC Tomb Burial mound and associated building , in use from 4500-4000 and 3000-2000 BC . Findings include pottery sherds , stone tools , jewelry , flint , and arrowheads . Originally covered by a turf mound 35m long
Tumulus de Dissignac France 4500-4000 BC Tumulus Two Dolmenic chambers are covered by 15 metre diameter tumulus with corridors 11 metres in length . Substantially rebuilt
Table des Marchand France 4000 BC Dolmen A modern cairn has been rebuilt over the capstone and supporting pillars
Temple of Ba ` alat Gebal Lebanon c. 2700 BC Temple Located in the Phoenician city of Byblos , the nearby Temple of the Obelisks dates to c.1900-1600 BC
Pyramid of Sekhemkhet aka the Buried Pyramid Egypt c. 2630 BC Burial An unfinished Third Dynasty structure largely hidden under sand . Only the lowest step of the pyramid was constructed at the time of his death
Great Sphinx of Giza Egypt 2558-2532 BC Statue The largest monolith statue in the world , possibly completed during the reign of Khafra , although the subject is controversial
King David 's Palace Israel 1000 BC Palace Most Likely the ruins of King David 's palace