Sea stacks along California Highway 1 south of Westport in Mendocino County, California.
Sea stacks are common features along the coast of northern California and Oregon. The miniature islands started out as headlands, small peninsulas extending from the coast like the one in the background of this picture. Waves and surf gradually eroded the middle of the headlands, leaving the end disconnected from the shore. Erosion will eventually wear away and flatten these sea stacks until they disappear from view.