a close view of a clear pool of water among rocks, with green aquatic plants visible
Tidepool on San Nicolas Island. ©Steve Schwartz.
A tidepool is a pool of water created at low tide, when the water leaves behind a rocky pool that was previously submerged by the waves. Many different kinds of organisms live in tidepools, including sea stars, sea anemones, mussels, crabs, sea urchins, and more.

Last updated: November 15, 2018