A few secondary forest roads including R0361 (south side of the lake) provide access to the Lac à la Catin watershed; these roads connect to route 381 (north-south direction) which runs along the Ha!

The surface of Lac à la Catin is usually frozen from the beginning of December to the end of March, however the safe circulation on the ice is generally done from mid-December to mid-March.

The mouth of Lac à la Catin is located about 4.8 km (3.0 mi) north of the boundary of the administrative regions of Saguenay–Lac-Saint-Jean and Capitale-Nationale.

The main watersheds neighboring Lac à la Catin are: Lac à la Catin has a length of 2.8 km (1.7 mi) in the shape of a cucumber star, a maximum width of 0.4 km (0.25 mi), an altitude is 597 m (1,959 ft) and an area of .

Its mouth is located to the northwest, at: From the confluence of Lac à la Catin, the current follows the course of: The toponym "Lac à la Catin" was formalized on December 5, 1968, by the Commission de toponymie du Québec.