Aransas National Wildlife Refuge is a 114,657 acre (464 km2) protected area situated on the southwest side of San Antonio Bay along the Gulf Coast of the U.S. state of Texas. It is located in parts of Aransas, Refugio, and Calhoun counties. The Aransas National Wildlife Refuge was established by Executive Order 7784 on 31 December 1937 by President Franklin D. Roosevelt as the Aransas Migratory Waterfowl Refuge as a refuge and breeding ground for migratory birds and other wildlife. The name was changed in 1939.