Natural Features & Ecosystems - Redwood National and State Parks (U.S. National Park Service) Though there are no natural ponds or lakes in the parks; there are lagoons and marshes, results of oceanic and tectonic processes. Also within the parks' boundaries are the estuaries at the mouths of the Klamath River and Redwood Creek. These estuaries provide several uses for humans and wildlife: a transition and nursery area for fish, valuable habitat for fresh and saltwater species, recreational area for park visitors and nearby communities, and a supply of water for farming and ranching. The rocky islands in the sea are common — and commonly known as seastacks. They are erosional features in which sandstones and mudstone wear away and cherts and greenstone are left behind. More than 40 percent of California's seabird population nest on these seastacks, which provides a world of protection from predators. When you see a crowd of birds on these rocks — and there can be thousands of them on one house-sized boulder — think of them as seastack cities!
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