A glacial river branches out in a broad coastal delta and meets the North Pacific Ocean at Kodiak Island. Coastal deltas like this one are ecological corridors that provide critical habitats for waterfowl and migratory birds and breeding grounds for fish. Photo by Steve Hillebrand / @USFWS ALT TEXT: A river branches out in a broad coastal delta and meets the ocean. Lush green-covered hills push right up to the shore.