Niagara Falls (/naɪˈæɡrə/) is the collective name for three waterfalls that straddle the international border between Canada and the United States; more specifically, between the province of Ontario and the state of New York. They form the southern end of the Niagara Gorge.

From largest to smallest, the three waterfalls are the Horseshoe Falls, the American Falls and the Bridal Veil Falls. The Horseshoe Falls lies on the border of the United States and Canada[1] with the American Falls entirely on the American side, separated by Goat Island. The smaller Bridal Veil Falls are also on the American side, separated from the other waterfalls by Luna Island. The international boundary line was originally drawn through Horseshoe Falls in 1819, but the boundary has long been in dispute due to natural erosion and construction.

Located on the Niagara River, which drains Lake Erie into Lake Ontario, the combined falls form the highest flow rate of any waterfall in the world that has a vertical drop of more than 165 feet (50 m). Horseshoe Falls is the most powerful waterfall in North America, as measured by flow rate. The falls are 17 miles (27 km) north-northwest of Buffalo, New York, and 75 miles (121 km) south-southeast of Toronto, between the twin cities of Niagara Falls, Ontario, and Niagara Falls, New York.

Niagara Falls was formed when glaciers receded at the end of the Wisconsin glaciation (the last ice age), and water from the newly formed Great Lakes carved a path through the Niagara Escarpment en route to the Atlantic Ocean. While not exceptionally high, Niagara Falls is very wide. More than six million cubic feet (168,000 m3) of water falls over the crest line every minute in high flow, and almost four million cubic feet (110,000 m3) on average.

Niagara Falls is famed both for its beauty and as a valuable source of hydroelectric power. Balancing recreational, commercial, and industrial uses has been a challenge for the stewards of the falls since the 19th century.

Toronto is Canada's largest city, the fourth largest in North America, and home to a diverse population of about 2.8 million people. It's a global centre for business, finance, arts and culture and is consistently ranked one of the world's most livable cities.

Ottawa (/ˈɒtəwə/[ɔtawa]) is the capital city of Canada. It stands on the south bank of the Ottawa River in the eastern portion of southern Ontario. Ottawa borders Gatineau, Quebec; the two form the core of the Ottawa–Gatineau census metropolitan area (CMA) and the National Capital Region (NCR). As of 2016 Ottawa has a city population of 934,243 and a metropolitan population of 1,323,783 making it the fourth-largest city and the fifth-largest CMA in Canada.

Founded in 1826 as Bytown, and incorporated as "Ottawa" in 1855, the city has evolved into the political and technological centre of Canada. Its original boundaries were expanded through numerous annexations and were ultimately replaced by a new city incorporation and amalgamation in 2001 which significantly increased its land area. The city name "Ottawa" was chosen in reference to the Ottawa River, the name of which is derived from the Algonquin Odawa, meaning "to trade".

Ottawa is the most educated city in Canada and is home to a number of post-secondary, research, and cultural institutions, including the National Arts Centre, the National Gallery, and numerous national museums. Ottawa has the highest standard of living in the nation and low unemployment. It ranked 2nd nationally, 24th worldwide in the quality of life index and is consistently rated the best place to live in Canada.