Border Lake is a term used to describe the four large lakes located on the border of the United States and Canada. These lakes are Lake Ontario, Lake Tahoe, Lake Erie, and Lake Huron. Lake Ontario is the smallest of the four, located in Ontario, Canada. Lake Tahoe is located in the Sierra Nevada Mountains between California and Nevada. Lake Erie is located in the Great Lakes region of the United States and Canada, and is the shallowest of the four. Lake Huron is the second largest of the four, located in Michigan and Ontario, Canada.