Great Brewster Island is one of the outer islands in the Boston Harbor Islands National Recreation Area, situated some 9 miles offshore of downtown Boston. The island has a permanent size of 18 acres, plus an intertidal zone of a further 49 acres. Unlike the other outer islands, which are low-lying outcroppings of bedrock, Great Brewster is a drumlin w…Great Brewster Island is one of the outer islands in the Boston Harbor Islands National Recreation Area, situated some 9 miles offshore of downtown Boston. The island has a permanent size of 18 acres, plus an intertidal zone of a further 49 acres. Unlike the other outer islands, which are low-lying outcroppings of bedrock, Great Brewster is a drumlin which reaches a height of over 100 feet above sea level. It has vegetation cover consisting of Eastern white pine, Asparagus, Apple Trees, Pear Trees, Sumac, Beach Roses, Grasses and Common Reeds, together with a large Gull colony. The birds are aggressive during nesting season and access by humans, which is by private boat only, is discouraged during that time.
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