Lagoon Mirim or Merín is a large estuarine lagoon which extends from southern Rio Grande do Sul state in Brazil into eastern Uruguay. Lagoa Mirim is separated from the Atlantic Ocean by a sandy, partially barren isthmus.
Location: Brazil and Uruguay
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)
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