Winter Island is an island connected by a causeway to Salem Neck in Salem. It is about 45 acres in size, and is bounded by Smith Pool to the northwest, Cat Cove to the west, Salem Channel to the south and east, and Juniper Cove to the north. The island has about a dozen residences at the north end and one road, Winter Island Road. The balance of the island is Winter Island Marine Park. The entire island was added to the National Register of Historic Places as Winter Island Historic District and Archeological District in 1994.