Lagoon Mirim

Lagoon Mirim
Lagoon Mirim
Location	BrazilandUruguay
Coordinates	32°45′S52°50′W
Type	estuarinelagoon
Primary outflows	São Gonçalo Channel
Catchment area	47,756.3 km2(18,438.8 sq mi)
Max. length	174 kilometres (108 mi)
Max. width	10 to 35 km (6 to 22 mi)
Surface area	3,750 km2(1,450 sq mi) to 3,899.7 km2(1,505.7 sq mi)
Average depth	6 m (20 ft)
Water volume	23.4 km3(5.6 cu mi)
Surface elevation	0 m (0 ft)

Fishermenat Lagoon Mirim

Lagoon Mirim(Portuguese,pronounced[miˈɾĩ]) orMerín(Spanish,pronounced[meˈɾin]) is a largeestuarinelagoonwhich extends from southernRio Grande do Sulstate inBrazilinto easternUruguay.Lagoa Mirim is separated from theAtlantic Oceanby a sandy, partially barrenisthmus.

TheJaguarão/Yaguarón,TacuaríandCebollatí Riversempty into Lagoon Mirim, while theSão Gonçalo Channelconnects it withLagoa dos Patosto the north.

Location

Lagoon Mirim is about 174 kilometres (108 mi) long by 10 to 35 km (6 to 22 mi) wide and 3,750 km²(1,450 sq mi) in area. It is more irregular in outline than its larger neighbor to the north,Lagoa dos Patos,and discharges into the latter throughSão Gonçalo Channel,which is navigable by small boats. Lagoa Mirim has no direct connection to the Atlantic, but the Rio Grande, a tidal channel about 39 km (24 mi) long which connects Lagoon dos Patos to the Atlantic, affords an entrance to the navigable inland waters of both lagoons and several small ports. Both lagoons are the remains of an ancient depression in the coastline shut in by sand beaches built up by the combined action ofwindandoceanic currents.They are at the same level as the ocean, but their waters are affected by the tides and arebrackishonly a short distance above the Rio Grande outlet.

TheTaim Ecological Stationlies to the east of the lagoon, in the narrow land strip between it and the Atlantic Ocean. TheJaguarão/Yaguarón River,which forms part of the Brazil-Uruguay boundary line, empties into Lagoon Mirim, and is navigable 42 km (26 mi) up to and beyond the twin towns ofJaguarão(Brazil) andRio Branco(Uruguay). On the Uruguayan side apart from the Yaguarón River, the Cebollatí River and the Tacuarí River empty into the Lagoon Mirim. The amount of water received by the lagoon is greater from the Uruguayan side.

See also

• Topography and hydrography of Uruguay
• 1851 Boundary Treaty (Brazil–Uruguay)
• Jaguarão River#Navigability

Sources

This article incorporates text from a publication now in thepublic domain:Lamoureux, Andrew Jackson (1911). "Brazil".InChisholm, Hugh(ed.).Encyclopædia Britannica.Vol. 4 (11th ed.). Cambridge University Press. pp. 439–442.