Thor's Well. Cape Perpetua, Oregon.
If you happen to be at Cape Perpetua when there's a 6.5 tide, and the swells are big enough to break the reef, be sure to look for the collapsed sea cave just to the north of Cooks Chasm. Popularly known as Thor's Well, this barnacle and blue mussel clad hole in the reef will not disappoint as it give the illusion of being a conduit for seawater flowing who knows where.
This outstanding intertidal area is managed by the United States Forest Service as part of the Siuslaw National Forest.
Cape Perpetua. Lincoln County, Oregon.