Lake Magog is a

freshwater lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from t ...

located in the

Estrie Estrie () is an List of Quebec regions, administrative region of Quebec that comprises the Eastern Townships. ''Estrie'', a French neologism, was coined as a derivative of ''est'', "east". Originally settled by anglophones, today it is about 90 pe ...

region of

Quebec Quebec is Canada's List of Canadian provinces and territories by area, largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, ...

, Canada. It is bordered by three municipalities:

Sherbrooke Sherbrooke ( , ) is a city in southern Quebec, Canada. It is at the confluence of the Saint-François River, Saint-François and Magog River, Magog rivers in the heart of the Estrie administrative region. Sherbrooke is also the name of a territ ...

, Magog and

Sainte-Catherine-de-Hatley Sainte-Catherine-de-Hatley is a municipality in the Memphrémagog Regional County Municipality in the Eastern Townships region of Quebec, Canada. Located along Quebec Route 108 on Little Lake Magog, it is the home of the "Marais" birdwatching s ...

. Located in the Appalachian geological province, Lake Magog consists of

sedimentary rock Sedimentary rocks are types of rock (geology), rock formed by the cementation (geology), cementation of sediments—i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)—that have been accumulated or de ...

, especially

slate Slate is a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade, regional metamorphism. It is the finest-grained foliated metamorphic ro ...

and

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

. Lake Magog is part of the watershed of the St. Francois River, which flows into the

St. Lawrence River The St. Lawrence River (, ) is a large international river in the middle latitudes of North America connecting the Great Lakes to the North Atlantic Ocean. Its waters flow in a northeasterly direction from Lake Ontario to the Gulf of St. Lawren ...

Hydrology

The drainage area of the

Magog River The Magog River, or Sekosonotek in Abenaki, is a river that drains Lake Memphremagog. It is a small river running through the territories of the cities of Magog, Quebec, Magog and Sherbrooke, in the administrative region of Estrie, in Quebec, in C ...

's watershed is . Lake Magog's the maximum length and width are and , respectively. Its area is . The maximum depth is and its and average depth is . Lake Magog's water is supplied mainly by the Magog River which flows from

Lake Memphremagog Lake Memphremagog (; , ) is a fresh water glacial lake located between Newport (city), Vermont, Newport, Vermont, United States and Magog, Quebec, Canada. The lake spans both Quebec and Vermont, but is mostly in Quebec. Most of the watershed th ...

. There are a couple of streams of different sizes that feed the river and Lake Magog. Four

hydroelectric dam Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

s were built near Lake Magog. Their role is to generate

electricity Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwel ...

and control the level of water. Magog Lake is a

reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

resulting from these dams, the most influential being that of Rock Forest built in 1911.Centrale Rock Forest - Ville de Sherbrooke
These dams alter the rate of renewal of the lake by changing the flow of the Magog River. Lake Magog contains eight

island An island or isle is a piece of land, distinct from a continent, completely surrounded by water. There are continental islands, which were formed by being split from a continent by plate tectonics, and oceanic islands, which have never been ...

s (all private), including two

islet An islet ( ) is generally a small island. Definitions vary, and are not precise, but some suggest that an islet is a very small, often unnamed, island with little or no vegetation to support human habitation. It may be made of rock, sand and/ ...

s, as well as two

shoal In oceanography, geomorphology, and Earth science, geoscience, a shoal is a natural submerged ridge, bank (geography), bank, or bar that consists of, or is covered by, sand or other unconsolidated material, and rises from the bed of a body ...

s which have been small islands in the past. Two islands are constructed: the island of the nautical club, and the largest island of the Marinier Archipelago (also known as Odanak Islands). At the southern end of the lake, a marsh is accessible to hikers.Île du Marais - Accueil
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References

External links

Association pour la préservation du lac Magog

Regroupement pour la préservation de l'île et du marais de Katevale (L'île du marais)
Magog Landforms of Sherbrooke Tributaries of the Saint Lawrence River Tourist attractions in Estrie {{Estrie-geo-stub