 | Caldera; Caldera; Composite Volcanoes; Crater; Geologic Hazards; Geomorphology; Groundwater; Hydrology; Lakes; Plate Tectonics; Stratovolcanoes; Stratovolcanoes; Surface Water; Tectonics; Volcanic Features; Volcanics; Volcanology; Water | Crater Lake in Oregon. Crater Lake is a volcanic caldera of Mt. Mazama that has filled with water. Wizard Island in the middle of the lake, and is one of the volcanic cones. Crater Lake is 1,932 feet (589 m) deep, making it the deepest lake in the United States. |