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The field borders Clear Lake, the source for the McKenzie River, [7] and lava flows from the field formed a dam that created the lake. [8] Clear Lake encompasses 148 acres (0.60 km 2 ) [ 9 ] near Oregon Route 126 , [ 10 ] with a shallow northern region and a deeper southern zone, which reaches a maximum depth of 175 feet (53 m). [ 9 ]
Lava Beds National Monument is located in northeastern California, in Siskiyou and Modoc counties. The monument lies on the northeastern flank of Medicine Lake Volcano, which is the largest volcano by area in the Cascade Range.
Like all Hawaiian volcanoes, Mauna Loa was created as the Pacific tectonic plate moved over the Hawaii hotspot in the Earth's underlying mantle. [10] The Hawaii island volcanoes are the most recent evidence of this process that, over 70 million years, has created the 3,700 mi (6,000 km)-long Hawaiian–Emperor seamount chain. [11]