Lac Archambault is a 10-kilometre-long lake located in Saint-Donat-de-Montcalm, in the Matawinie Regional County Municipality within the Lanaudière region of Quebec, roughly two hours north of Montréal. The lake sits on the boundary between the townships of Archambault and Lussier, immediately west of Lac Ouareau into which it drains to the southeast. The surrounding landscape is characterized by forested hills and mountains, including Montagne Noire at 875 metres elevation, with the village of Saint-Donat occupying a peninsula between the two lakes. The area lies just south of Parc national du Mont-Tremblant.

The primary access point for paddlers is Parc des Pionniers, located at 14 chemin Hector-Bilodeau in Saint-Donat, where a boat ramp is available. Launch access is paid, and parking is also paid, though free parking is available across the street. The park includes year-round bathrooms, picnic tables, a picnic shelter, and drinking water. A second boat launch on the west shore is accessible via chemin Régimbald and chemin des Épinettes. A permit is required to access the lake and surrounding lakes in the area; paddlers should consult the relevant authority's website for current details. Hull washing before launch is mandatory, and proof of washing must be provided.

Motorboat traffic is a notable consideration on Lac Archambault, and can make navigation more difficult. Only residents are permitted to use motors over 9.9 HP, unless access is via a campsite with a valid receipt. There are no campsites directly on Lac Archambault itself. Paddlers wishing to camp must travel north via a connecting river to Lac Pimbina, which requires a short portage around a small dam, continuing on to Lac Provost and Lac Lajoie within Mont-Tremblant Park.

The lake supports fishing for lake trout, rainbow trout, pike, and bass. Canoe, kayak, sailboat, pedal boat, and paddleboard rentals are available through Club nautique Saint-Donat at Parc des Pionniers, which also offers sailing lessons. Guided paddleboard day trips, lessons, and SUP yoga are offered by Time'sup Aventures. The Parc des Pionniers launch is open from 8h to 17h.