For centuries, people from all over the world have traveled to the border between New York State and the province of Ontario to witness the natural marvel that is Niagara Falls. The Niagara River flows north from Lake Erie, tumbles over the giant waterfall, and travels on to Lake Ontario. A geological feature known as the Niagara Escarpment, formed during the last ice age, is the reason the enormous falls formed thousands of years ago. A relatively small region, Niagara Falls and the surrounding area are still home to numerous species of plants and animals. Readers will learn about the ancient history of the falls, the geology, and wildlife, as well as human actions that have greatly affected this wonder of the world.