Tennis Island As it name implies, Tennis Island is separated from Wellesley by a short bridge. This collection of homes on the eastern end of Wellesley Island overlooks Boldt Castle on Heart Island as well as the Boldt Yacht House. Tennis Island is a private community, with no public water access. Homes have a uniform look and were built approximately 25 years ago. Tennis Island North borders the Thousand Islands Country Club's Old Course.
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