Grass Cay is an island of the United States Virgin Islands.
It is located between St. Thomas and St. John. It is approximately 1.6 miles (2.6 km) long by 1⁄8 mile (0.20 km) wide. There is no permanent human habitation. [1]
18°21′32″N64°49′58″W / 18.35889°N 64.83278°W