Niagara

There is more than one place called Niagara, all closely related:

Niagara Falls straddles the US/Canada border.

Canada

 * Niagara Peninsula - A region of the province of Ontario that includes areas of Canada surrounding Niagara Falls.
 * Niagara Falls (Ontario) - The city in the province of Ontario on the Canadian side of Niagara Falls.
 * Niagara-on-the-Lake - A small, historic town at the far northeast corner of the Niagara Region, at the mouth of the Niagara River.
 * Niagara is also the name of a neighbourhood along rapidly-gentrifying Queen Street in Toronto's West End.

United States of America

 * Niagara Frontier - A region of the state of New York that includes areas of the United States surrounding Niagara Falls.
 * Niagara County - a County in New York, part of the Niagara Frontier, containing the city of Niagara Falls.
 * Niagara Falls (New York) - The city in New York on the American side of Niagara Falls.