Thompson Island is an island in the Boston Harbor, about 1 mile offshore from downtown Boston, Massachusetts. The island is managed by the Thompson Island Outward Bound Education Center, a non-profit education organization. The island is open to visitors on Saturdays and Sundays from Memorial Day through Labor Day; otherwise access is by arrangement only. Thompson Island is one of the largest, most accessible and ecologically diverse islands in the Boston Harbor Islands National Recreation Area.
The island has a size of 170 acres , and the highest point is a drumlin that reaches a height of 78 feet above sea level. The rest of the island comprises low rolling hills and a salt marsh. The island has a mixed vegetation, including hardwood tree stands, remnant pear and apple orchards, ornamental trees and shrubs, and salt marsh grasses. The island has open meadows, forests, marine wetlands, sumac groves, and a variety of other geological features as well. Amenities include a formal school campus complete with classrooms, dormitories, dining hall, auditoriums, gymnasium, lab space, outdoor challenge courses, and climbing towers. At low tide, a sandbar connects it to Squaw Rock on the Squantum peninsula, allowing land travel between the two.
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