Wellesley Island is located in Jefferson County, New York, is partially in the Town of Orleans and partially in the Town of Alexandria. Also known for being one of the largest of the thousand Islands in the St. Lawrence River. The island has two State Parks, a nature center, and three golf courses. Communities on the Island include Collins Landing, Grandview, Moore Landing, Fineview, Thousand Island Park & Westminster Park. Local businesses include The Hart House & the Blue Heron Boat Works .