These Waterways Are Some Of The Most Diverse Ecosystems On The West Coast — And The Most Endangered

Most of the West Coast’s estuary habitat has vanished, according to a new study, the most thorough of its kind. The mapping project found that, today, less than 15% of historic estuaries remain along the Washington, Oregon and California coastlines.

Estuaries form where fresh water from rivers and streams meets the salt water of the ocean. They take the form of salt marshes, tidal forests, beaches and steep river mouths. They are among the most productive and diverse ecosystems on Earth. Estuaries are also among the most endangered habitats on the planet.