Shark Valley is a geological depression at the head of the Shark River Slough in far western Miami-Dade County, Florida, United States. It is currently part of Everglades National Park. Shark Valley empties into Shark River in the Ten Thousand Islands of Monroe County. Shark Valley characteristically includes sawgrass prairie that floods during the rainy season, hence the name "river of grass"—Pa-Hay-Okee, from the Mikasuki language—for such marshes in the Everglades.