Grover Island is an island located near the mouth of Crooked River in Camden County, Georgia. The island has over 400 acres (1.6 km2) of forest and about 1,600 acres (6 km2) of connected salt marsh and small waterways. Grover Island is four miles (6 km) west of Cumberland Island National Seashore. It was the site of the United States' first national forest preserve.