Ottawa (ⁱ/ˈɒtəwɑː/ or /ˈɒtəwə/) is the capital of Canada. It is the second largest city in Ontario and the fourth largest city in the country. The city is located on the south bank of the Ottawa River in the eastern portion of Southern Ontario. Ottawa borders Gatineau, Quebec, located on the north bank of the Ottawa River; together they form the National Capital Region (NCR).

Founded in 1826 as Bytown and incorporated as "Ottawa" in 1855, the city has evolved into a political and technological centre of Canada. Its original boundaries were expanded through numerous minor annexations and ultimately replaced by a new city incorporation and major amalgamation in 2001 which significantly increased its land area. The name "Ottawa" is derived from the Algonquin word adawe, meaning "to trade". Initially an Irish and French Christian settlement, Ottawa has become a multicultural city with a diverse population.

The 2011 census had the city's population as 883,391, and the metropolitan population as 1,236,324.Mercer ranks Ottawa with the second highest quality of living of any large city in the Americas, and 14th highest in the world. It is also rated the second cleanest city in Canada, and third cleanest city in the world. In 2012, the city was ranked for the third consecutive year as the best community in Canada to live in by MoneySense.

Ontario /ɒnˈtɛərioʊ/ is one of the provinces of Canada, located in east-central Canada. It is Canada's most populous province or territory and fourth largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa.

Ontario is bordered by the province of Manitoba to the west, Hudson Bay to the north, Quebec to the east, and to the south by the U.S. states of Minnesota, Michigan (portions to the west), New York (portions to the east), Ohio and Pennsylvania. All but a small part of Ontario's 2,700 km (1,677 mi) border with the United States follow inland waterways: from the west at Lake of the Woods, eastward along the major rivers and lakes of the Great Lakes/St. Lawrence River drainage system. These are the Rainy River, the Pigeon River, Lake Superior, the St. Mary's River, Lake Huron, the St. Clair River, Lake St. Clair, the Detroit River, Lake Erie, the Niagara River, Lake Ontario, and along the St. Lawrence River from Kingston, Ontario to the Quebec boundary just east of Cornwall, Ontario.