Hudson's Bay Co. post, originally called South River fort, at junction of Kenogami and Kabinakagami rivers, Ontario, about 75 miles south of Henley House. It was established before 1832 as South River House and is so named on Arrowsmith map 1832 (No. 101) also on Arrowsmith 1848 and 1857 (No. 8). This post was included in the 1857 list. About 1860 it was closed and re-established about 30 miles further down the river and named New Post at mouth of Wabashi river on right side. About 1880 New Post was moved back to the old site (Mamattawa) and then named English River House. Under this latter name it appears on the 1894 list and 1925. Mamattawa (sometimes written Mamawimattawa) is the contraction of an Indian word signifying "the coming together of many branches". Two large tributaries here join the river from the east and both of these receive branches near their mouths. See maps No. 52 & 78.