Sea stacks are tall columns of rock that jut out of the ocean. They are formed when waves erode the coastline, leaving behind isolated pieces of land that were once connected to the mainland. Full definition
But after a ship accidentally introduced black rats to the island about a century ago, the stick insects disappeared, only to be found 40 years later on a nearby volcanic sea stack. (sciencemag.org)
There are spectacular sea stacks, sea caves, tidal pools and endless spots to explore on the sandy beach. (coveadventuretours.com)
According to reports, not only did the bridge collapse, but the supporting sea stack fell along with it. (uponarriving.com)