Crater Lake is a caldera lake in the western United States, located in south-central Oregon. Two islands are in Crater Lake; Wizard Island formed from a cinder cone that erupted after Crater Lake began to fill with water, and the smaller Phantom Ship has seven different trees living on it.
Max. length 6 mi (9.7 km)
Max. width 5 mi (8.0 km)
Surface area 20.6 sq mi (53 km2)
Average depth 1,148 ft (350 m)
Max. depth 1,949 ft (594 m)

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Reference: https://en.wikipedia.org/wiki/Crater_Lake