São Lourenço River (Mato Grosso)

São Lourenço River
Aerial view of the São Lourenço River in the Pantanal
Native name	Rio São Lourenço
Country	Brazil
Basin features
Main source	Mato Grosso state
River mouth	Paraguay River 17°54′05″S 57°27′33″W / 17.901257°S 57.459036°W / -17.901257; -57.459036Coordinates: 17°54′05″S 57°27′33″W / 17.901257°S 57.459036°W / -17.901257; -57.459036
River system	Paraguay River
Tributaries	Left: Piquirí River Right: Cuiabá River

The São Lourenço River is a tributary of the Paraguay River within the Pantanal, an alluvial plain that spans portions of Brazil, Bolivia and Paraguay. The São Lourenço river basin lies in the Mato Grosso state of Brazil.

The São Lourenço River rises in the south of Mato Grosso, and is sometimes called the Pingara River in its upper reaches. It flows west into the Encontro das Águas State Park, where it is joined by the Cuiabá River. The São Lourenço continues southwest across the park, then defines the west border of the southern part of the park. The park is bounded to the south by the Piquiri River, which defines the border with the state of Mato Grosso do Sul. The Piquiri flows west to join the São Lourenço at the southwest boundary of the park. The São Lourenço continues in a southwest direction along the border between Mato Grosso and Mato Grosso do Sul until it joins the Paraguay River. It forms part of the southern boundary of the Pantanal Matogrossense National Park just before joining the Paraguay.