Reichenau Island is an island in Lake Constance in southern Germany. It lies almost due west of the city of Konstanz, between the Gnadensee and the Untersee, two parts of Lake Constance. With a total land surface of 4.3 square kilometres and a circumference of 11 kilometres, the island is 4.5 kilometres long and 1.5 kilometres wide at its greatest extent. The highest point, the Hochwart, stands some 43 metres above the lake surface and 438.7 metres above mean sea level.
Reichenau is connected to the mainland by a causeway, completed in 1838, which is intersected between the ruins of Schopflen Castle and the eastern end of Reichenau Island by a 10-metre-wide and 95-metre long waterway, the Bruckgraben. A low road bridge allows the passage of ordinary boats but not of sailing-boats.
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