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[[File:Thor's Well (37588682016).jpg|250px|border|right|thumb|Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon]] | [[File:Thor's Well (37588682016).jpg|250px|border|right|thumb|Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon]] | ||
* Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon, that drains at high tides | * Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon, that drains at high tides | ||
[[File:December_Giant_sinkhole_collapse_USGS_1972.jpg| | [[File:December_Giant_sinkhole_collapse_USGS_1972.jpg|200px|border|right|thumb|More than three acres of forest suddenly disappeared into this "December Giant" sinkhole in Montevallo, Alabama, USA.]] | ||
* Golly Hole in Shelby County is considered the largest sinkhole in the US. | * Golly Hole in Shelby County is considered the largest sinkhole in the US. | ||
** it is 325 ft long, 300 ft wide, and 120 ft deep | ** it is 325 ft long, 300 ft wide, and 120 ft deep |