Hole-in-the-Ground is a large maar (explosion crater) in the Fort Rock Basin of Lake County central Oregon northeast of Crater Lake near Oregon Route 31.It is about 1600 meters (1.0 mi) across a little longer N-S than E-W. Its floor is about 150 meters (490 ft) below the surrounding ground level and has a rim that rises 35 to 65 meters (110 to 210 ft) above the highest point on the east side.
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