Choate Island, also known as Hog Island, is an island located in the Essex River Estuary in Essex, Massachusetts. It is part of the Crane Wildlife Refuge, which is owned and managed by The Trustees of Reservations. The 135-acre (0.55 km²) island is a refuge for a variety of birds and animals. It is surrounded by a salt marsh and has a spruce forest which was planted in the 1930s and makes the island easily visible from much of the surrounding area. The island has been inhabited by the Native Americans of the area, and was visited by early Europeans, who established farming on the island.