Tvären
Tvären is a circular bay close to Studsvik, Sweden. The bay lies above an ancient buried impact crater about 2 km in diameter. The crater is estimated to be about 455 million years old (Late Ordovician).
Asteroid 7771 Tvären is named after the bay.
Coordinates: 58°46′N 17°25′E / 58.767°N 17.417°E
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