Everglades & Dry Tortugas, Biosphere reserve in Florida Keys, United States.

The Everglades & Dry Tortugas Biosphere Reserve, established in 1976, covers 636,411 hectares across Florida and the Gulf of Mexico. It joins Everglades National Park, a shallow basin tilted southwest over Pleistocene limestone, with Dry Tortugas National Park, seven coral reefs and three banks forming a pseudo-atoll around Fort Jefferson.

The reserve was established in 1976 as a UNESCO Biosphere Reserve, covering 636,411 hectares across Everglades National Park and Dry Tortugas National Park, including Fort Jefferson and the seven Dry Tortugas islands. Its designation followed the earlier protection of the two national parks, and the reserve now records some 200 known archaeological sites, two of them nominated as districts on the National Register of Historic Places.

The reserve holds some 200 known archaeological sites, two of them archaeological districts listed in the National Register of Historic Places. They record Native American use, settlement, farming and fishing. The Miccosukee Tribe of Florida keeps a special use trust area inside Everglades National Park, with tribal headquarters, a visitor center, housing and businesses.

The reserve spans two separate units: Everglades National Park on the mainland and Dry Tortugas National Park, 113 km west of Key West, reached only by boat or seaplane. Fort Jefferson on Garden Key is the landing point for the seven islands. The Everglades Regional Collection Center holds 50,000 artifacts and a 10,000-volume library.

This is one of the few places on earth where freshwater and saltwater ecosystems exist side by side and influence each other. This arrangement creates rare conditions where specialized animals like manatees, American crocodiles, and various bird species thrive.