Lake Saint Pierre

Lake Saint Pierre () is a lake in Quebec, Canada, a widening of the Saint Lawrence River between Sorel-Tracy and Trois-Rivières. It is located downstream, and northeast, of Montreal; and upstream, and southwest, of Quebec City. The end of the lake delimits the beginning of the estuary of Saint Lawrence.
This lake which is long (excluding Sorel Islands) and wide, is part of the St. Lawrence Seaway. Including its shoreline, islands, and wetlands, the lake is a nature reserve. The body of water is recognized as a Ramsar site and as a Biosphere Reserve, due to the presence of many marshes and wetlands that are frequented by waterfowl. Recreational activities on the river (such as fishing, boating, sailing, swimming, water skiing, nature observation) are active mainly in summer season. Sport fishing is particularly popular, including ice fishing, especially in the great bay of Pointe-du-Lac.
Around Lake Saint-Pierre, several recreational services are available including marinas, hotel services, restaurants, outfitters, docks, gas stations, and cruises.
Geography.
Approximately 12,500 years ago, the retreat of the glaciers at the end of the last ice age resulted in a vast basin filled by the Champlain Sea. This sea extended from the city of Quebec to the east, and covered the Lower Mauricie, the Lower Laurentians, the lower part of the Ottawa Valley, Lake Ontario on the western side, and Lake Champlain USA) on the South side. The outline of the Champlain Sea is marked by ancient sandy shores where sand pits have been exploited. The water level has dropped some 8,000 years ago. The surface area of the watershed is (equivalent to more than 60% of the surface area of Quebec). 58% of the catchment area is located in the United States, 28% in Ontario and only 14% in Quebec (2.5% in direct tributaries, 0.07% in the littoral zone). Lake Saint-Pierre is linked to 11 administrative regions, 58 RCMs and 654 municipalities.
The lake is located in the Regional County Municipalities of Nicolet-Yamaska, Maskinongé, D'Autray, and Pierre-De Saurel, in addition to the city of Trois-Rivières. The shores of the lake affect several municipalities: 
Lake Saint-Pierre is fed by the St. Lawrence River (coming from the southwest) and the 14 main tributaries:
The average depth of the lake is only three meters. The channel of the seaway that has been dredged has a maximum depth of 11.3 m.
Toponymy.
The lake was named by Samuel de Champlain following its passage on 29 June 1603, the day of the Saint-Pierre. The Abenaki called Lake "Nebesek", which means at lac. Jacques Cartier, during his second voyage to Canada in 1535, had given him the name of "Angoulême".
Natural environment.
This seasonally-flooded area is an important stopping point for hundreds of thousands of migrating waterfowl. It is also an important nesting area for herons: more have been counted here than in any other place in North America. In 1998, it was recognized as a wetland of international significance under the Ramsar Convention.
The wildlife experts have identified 23 species of mammals around Lake Saint-Pierre, one of the most abundant species is the muskrat ("Ondatra zibethicus"), which is found in abundance in the lake.
Biosphere Reserve.
Lake Saint-Pierre was appointed Biosphere Reserve by UNESCO in 2000. "The biosphere reserve of Lac-Saint-Pierre" has an area of , whose in core areas and in buffer zones. The core areas are composed of Wildlife Refuge Great Island and bird refuge Nicolet.
Nearly 290 species of birds, about 90 species of fish and 27 rare plants have been listed in this biosphere reserve.
Wildlife Sanctuary of Great Island.
Wildlife Sanctuary of "Grande-Île" (Great Island) is located on Grande-île in the Archipelago of Saint-Pierre Lake. It has an area of . This wildlife refuge was created in 1992 is the protection of one of the largest heron colonies in North America. It houses more than 5,000 herons.
Nicolet Bird Sanctuary.
The "birds Nicolet refuge" is a protected area of which protects a staging area for ducks and Canada goose and also a nesting area for waterfowl. National Defence has acquired the site in the 1950. The site was recognized as a rest area in 1969 and as a refuge in 1982.
History.
Being the last freshwater basin of the St. Lawrence River and its geographical position, Lake Saint-Pierre has marked the history of French Canada in terms of the fishing industry, hunting, transportation including the St. Lawrence Seaway, pleasure boating, the settlement of surrounding lands, winter ice roads and ferries.
Samuel de Champlain wrote, in 1609: "On the south side, there are two rivers, one called the" Rivière du Pont (Nicolet) and the other of Gennes (Saint-François or Yamaska), which are very beautiful and in beautiful and good country. "