Black River is an unincorporated Dispersed Rural Community in the municipality of South Stormont, United Counties of Stormont, Dundas and Glengarry in eastern Ontario, Canada. It is located about north of Ontario Highway 401 and northeast of the community of Long Sault, and is on the Raisin River. See also Black River-Matheson, Ontario, a township municipality in Cochrane District References Other map sources: Communities in the United Counties of Stormont, Dundas and Glengarry