Johns Hopkins Glacier is found at the end of Johns Hopkins Inlet, in the farthest northwest of the Glacier Bay fjord. The glacier fills the end of the fjord, stretching about 1-mile (1.6 km) wide, and reaching 250 feet (76 m) high above the waterline. The ice front extends under sea level, to a depth of approximately 200 feet (61 m), where an underwater moraine protects the deepest extent of the glacial ice like armor against the warm ocean water.