Lake Témiscouata is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the Témiscouata region

Témiscouata Regional County Municipality, Quebec

Témiscouata is a county regional municipality of Quebec in Canada. It is located southeast of Rivière-du-Loup, bordering New Brunswick, and is centred around Lake Témiscouata.Major industries include forestry, agriculture and maple syrup products....

 of southeastern Quebec

Quebec

Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....

. It is 45 km

1 E4 m

To help compare different orders of magnitude this page lists lengths between 10 and 100 kilometres . The myriametre is a deprecated unit name; the prefix myria- is obsolete, not included among the prefixes when the International System of Units was introduced in 1960.Distances shorter than 10...

 long and 5 km wide. The Madawaska River

Madawaska River (Saint John)

The Madawaska River flows from Lake Témiscouata in Quebec to join the Saint John River at Edmundston, New Brunswick.The river's name comes from the Algonquian word "Madoueskak", which means "land of the porcupine"....

 flows from this lake to the Saint John River.

The city of Cabano

Cabano, Quebec

Cabano is a city in Témiscouata Regional County Municipality within the Bas-Saint-Laurent region of Quebec, Canada. It is situated on Lake Témiscouata on Route 185.On May 9, 1950, a fire destroyed a large part of the city....

 is located on this lake. Forestry

Forestry

Forestry is the interdisciplinary profession embracing the science, art, and craft of creating, managing, using, and conserving forests and associated resources in a sustainable manner to meet desired goals, needs, and values for human benefit. Forestry is practiced in plantations and natural stands...

 is a major industry in this area.

The Petit Témis Interprovincial Bicycle Path, runs from Rivière-du-Loup, Quebec

Quebec

Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....

 to Edmundston, New Brunswick

New Brunswick

New Brunswick is one of Canada's three Maritime provinces and is the only province in the federation that is constitutionally bilingual . The provincial capital is Fredericton and Saint John is the most populous city. Greater Moncton is the largest Census Metropolitan Area...

, following an abandoned CN Rail

Canadian National Railway

The Canadian National Railway Company is a Canadian Class I railway headquartered in Montreal, Quebec. CN's slogan is "North America's Railroad"....

 line along the lake.

The lake's name means "deep water" in the Maliseet language.

The lake is theorized to be the inspiration for the nearby parish of Saint-Louis-du-Ha! Ha!

Saint-Louis-du-Ha! Ha!, Quebec

Saint-Louis-du-Ha! Ha! is a parish in the regional county municipality of Témiscouata, Quebec, near the south shore of the Saint Lawrence River in Canada...

. One explanation suggests the archaic French

French language

French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...

 word haha, here meaning an unexpected obstacle or abruptly ending path, as the lake is an extremely long and particularly formidable obstacle to travel.