Stretching from Lake Ontario north along the St. Lawrence River to La, Thousand Islands, New York, USA ke Champlain, the Thousand Islands Region -- which celebrated its 100th anniversary in 1997 -- includes 30 state parks, 1 historic site and 6 boat launches, as well as thousands of great campsites Stretching from Lake Ontario north along the St. Lawrence River to Lake Champlain, the Thousand Islands Region -- which celebrated its 100th anniversary in 1997 -- includes 30 state parks, 1 historic site and 6 boat launches, as well as thousands of great campsites. At the southern end of the region lies Southwick Beach State Park, which offers 110 campsites, picnicking and swimming along the finest freshwater sand beach in the northeast. On the St. Lawrence River is Wellesley Island State Park, the largest of the 30 parks within the region. Wellesley Island features several winterized cabins, 429 campsites, a marina and golf course. The Minna Anthony Common Nature Center ...