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Point Reyes National Seashore Intertidal and Subtidal Zones

The intertidal area is where the land merges under the ocean and the tidal zones begin. This complex marine ecosystem is found along coastlines worldwide with general similarities expressed by local diversity. It is a fascinating place to explore and appreciate, especially when accompanied by an understanding of the ecology that holds it together.

At Point Reyes National Seashore, the intertidal zone is characterized by four zones delineated mostly by the amounts of moisture, exposure to the sun, water movement, temperature, and salinity.

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National Park Spotlight
Bryce Canyon National Park
Bryce Canyon National Park
Featured Wildlife
Maine Puffins
Maine Puffins

Maine ocean islands provide the only nesting sites for Atlantic puffins in the United States. Eastern Egg Rock in the midcoast region, Seal Island and Matinicus Rock at the mouth of Penobscot Bay, and Machias Seal Island and Petit Manan Island off the downeast coast provide habitat for more than 4,000 puffins each summer.