Thor's Well, Oregon

Thor's Well is a natural saltwater drain hole in the volcanic basalt coastline of Cape Perpetua Scenic Area on the central Oregon coast, located approximately 3 miles south of Yachats within Siuslaw National Forest. The feature appears to be a bottomless pit into which the Pacific Ocean drains — a drainhole formed by the collapse of a sea cave roof, creating a roughly 20-foot-wide opening in the basalt that fills and empties dramatically with each wave. At high tide, particularly during large swells, incoming waves funnel into the hole, filling it from below as water simultaneously surges over the rim, creating the illusion that the ocean is actively draining into the earth. As waves recede, water cascades back down the interior walls in sheets. The phenomenon is most dramatic and photogenic in the hour before and after high tide and during periods of high Pacific swell, typically associated with winter storms. Thor's Well has become one of the most photographed natural features on the Oregon coast after extensive circulation of long-exposure images capturing the turbulent water motion. The site is reached by a short trail from the Cape Cove parking area: a 0.25-mile walk on a maintained path through coastal forest to the shoreline. The basalt platform surrounding the well is low, wet, and uneven; the danger of being swept off the rocks by unexpected large waves is real and has resulted in fatalities. The Forest Service posts warning signs and advises visitors to never turn their backs to the ocean, to stay well back from the edge during large swells, and to check tide charts and swell forecasts before visiting. The surrounding Cape Perpetua area contains additional geological features including the Spouting Horn and Cook's Chasm.