The East River is a 10-mile-long river entirely within Wakulla County, Florida, draining part of the St. Marks National Wildlife Refuge into the St. Marks River. A dam within the refuge, crossed by the Florida Trail, creates the 245-acre impoundment known as the East River Pool, with a boat ramp allowing access by canoes and small boats. Oyster bars are ab…The East River is a 10-mile-long river entirely within Wakulla County, Florida, draining part of the St. Marks National Wildlife Refuge into the St. Marks River. A dam within the refuge, crossed by the Florida Trail, creates the 245-acre impoundment known as the East River Pool, with a boat ramp allowing access by canoes and small boats. Oyster bars are abundant around the mouth of the river.