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¤ On Black ¤ On White ¤ Crater Lake is a lake in the U.S. state of Oregon that is 5 by 6 miles (8 by 9.6 km) and 1958 ft (597 m) deep. It is Crater Lake National Park's most prominent feature and is famous for its deep blue color and water clarity. The lake partly fills a nearly 4000 ft (1220 m) deep caldera that was formed around 7700 years ago by the collapse of the volcano Mount Mazama. The lake's average depth is 1,148 ft (350 m). Its deepest point has been measured at 1949 ft (594 m) deep, though as with any lake its depth fluctuates with the climate, particularly rainfall. This makes Crater Lake the deepest lake in the United States, the second deepest lake in North America (Great Slave Lake is the deepest) and the seventh deepest lake in the world (Lake Baikal is the deepest). It also holds the honor of being the deepest lake in the world that is completely above sea level. The caldera rim ranges in elevation from 7000 to 8000 ft (2130 to 2440 m). The average elevation of the lake's surface is 6178 ft (1883 m). --from Wiki paulomernik.com