Østerøya (East Island) is one of two peninsulas outside Sandefjord, Norway. It borders in west to the Mefjord and east to the Tønsbergfjord. Tønsberg Barrel is located on the southern end of the peninsula. Tønsberg Barrel is an old beacon mentioned in Sverris saga. It has been described as one of the most beautiful sites in Sandefjord. East Island lies between the Tønsbergfjord and Mefjord. It has a large number of beaches, campgrounds, recreational areas, and vacation homes. The peninsula has a length of 10 km, and is between 1 and 2 km in width. It was previously known as Yxnøy, a name which now is used for East Island’s southernmost point. Yxnøy, also spelled Yxney, is now a recreational area home to several beaches, forests, sloping rocks, hiking trails, and Tønsberg Barrel. The peninsula is now named East Island as it is located east of the Sandefjord city centre. The southern end of the peninsula contains public areas for outdoor activities, recreation, fishing and swimming. A preserved area with black alder swamp forest (containing ramsons, iris pseudacorus and early purple orchid) is located here. During the Viking Age, ocean water levels were three metres higher, which meant both Vesterøya- and Østerøya peninsulas were islands surrounded by ocean waters. There are 20 km (12 mi.) of hiking trails on East Island, which is an extension of the 25 km (15 mi.) coastal path at West Island. Combined the 45 km (28 mi.) hiking trail is part of the international North Sea Trail. Head Above Water ("Hodet over vannet") by film director Nils Gaup was filmed at the southern tip of Østerøya and features Ertsvika at Yxnøy. Yxnøy Yxnøy is one of the largest undeveloped areas found along the Vestfold coast. The 5-meter (16 ft.) tall Tønsberg Barrel is an old beacon mentioned in Sverris saga from around year 1200. Many ships have sunk near the landmark, which is located at Yxnøy (Yxney) on the southern tip of East Island. The seamark (navigation mark) sits on the mountain Tønneberget (Stenbåken) with ocean-views in all directions. It has an elevation of 37 meters (121 ft.) and marks the entry point for the city of Tønsberg. Its circumference is at its most 12 meters (39 ft.), and it is painted in white and black. The beacon originally consisted of a barrel, hence the name, but was replaced with the current seamark in 1900.