Cornwall.

Cornwall sits on the north bank of the St. Lawrence River at the easternmost edge of Ontario, downstream of the Moses-Saunders Power Dam where the river opens into Lake St.

Francis. Lamoureux Park anchors the downtown waterfront with the Cornwall Community Museum, the bandshell, and a riverfront promenade beside the surviving lock infrastructure of the Cornwall Canal — the 1834–1843 north-shore canal that bypassed the Long Sault Rapids until the St.

Lawrence Seaway opened in 1959 and the canal was decommissioned. The Cornwall Recreational Path runs roughly 22 km along the river through the city as a documented Great Lakes Waterfront Trail community segment, connecting Lamoureux Park east to the Raisin Region Conservation Authority's Gray's Creek Conservation Area at the city's eastern edge.

The St. Lawrence River Institute of Environmental Sciences operates from Cornwall as a freshwater research and education centre.

Across the river, Cornwall Island and the south shore are the Mohawk Territory of Akwesasne — sovereign territory of the Mohawks of Akwesasne, governed in part by the Mohawk Council of Akwesasne — reached by the Seaway International Bridge.