sentences:  In the Thousand Islands, I-81 runs across Wellesley Island, one of the archipelago's largest.It initially heads northwest across the sparsely developed island, connecting to a pair of county-maintained roads before turning northeast at the eastern edge of Wellesley Island State Park.The freeway turns one final time near the northern edge of the island, curving back to the northwest at exit 52, the last exit along I-81.