Assertion: caldera's diameter | /r/HasProperty | about 24 km
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Source sentences:
text: [ˈlaːxɐ ˈzeː]) or Lake Laach (in English) is a volcanic caldera lake with a diameter of 2 km (1.2 mi) in Rhineland-Palatinate, Germany, about 24 km (15 mi) northwest of Koblenz and 37 km (23 mi) south of Bonn, and is closest to the town of Andernach situated 8 km (5.0 mi) to the east on the river Rhine.