The Saint John River is a major river located in eastern Canada, primarily flowing through the province of New Brunswick. It originates from the Maine highlands in the United States and travels approximately 673 kilometers (418 miles) before emptying into the Bay of Fundy. The river is known for its unique tidal phenomenon, where the tide can reverse the flow of the river in certain areas. The Saint John River basin is an important ecological and economic region. It supports various wildlife habitats and is a vital resource for local communities. The river also plays a significant role in transportation, recreation, and hydroelectric power generation in the area.