The Zec Kiskissink covers the line of the watershed between the Saint-Maurice River and that of Lac Saint-Jean.

This river whose surface is usually frozen from November to April, flows mainly in forest land, except for the last kilometers before its mouth.

The course of the river fellow the path on the southeast side of route 155 on the last 39 km (measured by water).

However, at 2.1 km upstream of the Canadian National railway bridge, marking its mouth, the river crosses route 155.

The name of this river 88 km commemorates Jean-Baptiste Bostonians, a trapper Abenaki originally from Boston, Massachusetts, New England who had a hunting service in the region.