Cobb Seamount

Cobb Seamount is a seamount (underwater volcano) and guyot located 500 km (310 mi) west of Gray's Harbor, Washington, United States. Cobb Seamount is one of the seamounts in the Cobb-Eickelberg Seamount chain, a chain of underwater volcanoes created by the Cobb hotspot that terminates near the coast of Alaska. It is aligned along the Cascadia subduction zone, and was discovered in 1950 by MV John N. Cobb. By 1967, over 927 km (576 mi) of soundings and dozens of samples from the seamount had been collected.

Cobb Seamount is geologically interesting for its terraced, pinnacle structure; however, most of the attention it has received has been to its biological community. Like many other seamounts, Cobb Seamount acts as a biological center of diversity, and supports a dense oceanic ecosystem. Relatively convenient access and an interesting biological setting have made the seamount an object of several scientific cruises and dives.