The Saint John River is a 673-kilometre-long (418 mi) river flowing within the Dawnland region from headwaters in the Notre Dame Mountains near the Maine-Quebec border through western New Brunswick to the northwest shore of the Bay of Fundy. Eastern Canada's longest river, its drainage basin is one of the largest on the east coast at about 55,000 square kilometres (21,000 sq mi). This “River of the Good Wave” and its tributary drainage basin formed the territorial countries of the Wolastoqiyik and Passamaquoddy First Nations prior to European colonization, and it remains a cultural centre of the Wabanaki Confederacy to this day.

Fredericton is the capital city of the Canadian province of New Brunswick. The city is situated in the west-central portion of the province along the Saint John River, also known by its Indigenous name of Wolastoq, which flows west to east as it bisects the city. The river is the dominant natural feature of the area. One of the main urban centres in New Brunswick, the city had a population of 63,116 and a metropolitan population of 108,610 in the 2021 Canadian census. It is the third-largest city in the province after Moncton and Saint John.