Lake Ontario is the smallest and most easterly of the Great Lakes of North America, bounded by Canada and the United States. Learn about its geography, climate, ports, islands, and history from Britannica's editors and experts.

Learn about Lake Ontario, the smallest and most easterly of the Great Lakes, located in North America. Find out its shape, depth, drainage basin, islands, flora and fauna, and history.

Learn about Lake Ontario, the smallest and most populous of the Great Lakes, and its diverse habitats, wildlife, and human activities. Discover its geography, history, and cultural significance, from Niagara Falls to the Oak Ridges Moraine.

Discover 10 stunning beaches on Lake Ontario, from sandy shores to rocky cliffs, with activities for all seasons. Learn about the water quality, camping, hiking, and wildlife at these scenic destinations in New York State.

Explore the attractions and activities along the shoreline of Lake Ontario, the smallest and easternmost of the Great Lakes. From state parks and lighthouses to museums and waterfalls, discover the natural and cultural wonders of this region.

Explore the southern shore of Lake Ontario and the St. Lawrence River with this weekend itinerary. Enjoy history, fishing, beaches, brews, and more in Rochester, Oswego, and Clayton.

Learn about the geography, geology, history and features of Lake Ontario, the smallest and most easterly of the Great Lakes. Find out how the lake is used for shipping, recreation, agriculture and industry, and what challenges it faces from pollution.

Learn about the history, geography, and ecology of Lake Ontario, the smallest and lowest of the Great Lakes. Discover the museums, attractions, and activities along its shores in the US and Canada.

Lake Ontario is one of the five Great Lakes of North America, bordering Canada and the U.S. It has crystal-clear waters, diverse fish species, rich wildlife, and scenic attractions such as Niagara Falls and Toronto.