The Thousand Islands are a chain of islands that straddle the US-Canada border in the Saint Lawrence River near Lake Ontario. There are over 1,865 islands ranging dramatically in size, from some over 100 square kilometers to small rocky outcroppings. The islands stretch for about 80 kilometers downstream from Kingston, Ontario, and include islands in both the United States and Canada. It is a very popular tourist destination for boating, camping, and vacations.