Ha!, pronounced [pəti lak a a]) is a freshwater lake in the Ferland-et Boilleau municipality, in the administrative region of Saguenay-Lac-Saint-Jean, in the province of Quebec, in Canada.

The ice shelf is generally thick enough to allow safe passage from mid-December to late March.

This lake is located at 2.6 kilometres (1.6 mi) south-west of the summit (altitude: 822 metres (2,697 ft)) of the Mount Four.

has a length of 4.9 kilometres (3.0 mi) between the surrounding mountains, forming a southward hook at the western end of Lake Ha!

on 6.8 kilometres (4.2 mi) northwesterly to the dam at its mouth, then the stream successively descends the Ha!

One popular interpretation associates it with an exclamation indicating irony or onomatopoeia of laughter.

However, the name probably comes from an alteration of a Montagnais toponym almost unpronounceable in French, which in Algonquin means a place where bark is exchanged.

According to some historians, this specific is derived from the French word ha-ha meaning "an unexpected obstacle on a path".

Additionally, the recollect Gabriel Sagard (baptized Théodat) published the Dictionary of the Huron Language (Paris, 1632), listing the noun Háhattey, meaning "road, lane or address".