The Rio São Lourenço is a significant river in the state of Mato Grosso, Brazil, and a major tributary of the Paraguay River. It flows through the vast Pantanal, the world's largest tropical wetland, which defines its character. The river's course is part of an alluvial plain, and its confluence with the Paraguay River features a low-lying, seasonally flooded island approximately two miles in length. A specific and notable paddling route involves a 25.8-mile out-and-back trail near Porto Três Irmãos, which is suitable for canoeing and kayaking. This route begins on the Piquiri River and connects to the São Lourenço, suggesting a multi-river safari-style experience. The Pantanal setting promises abundant wildlife viewing opportunities, and the landscape is typified by expansive wetlands and seasonally flooded areas. Paddling here is intrinsically tied to the seasonal rhythms of the Pantanal, with water levels and accessibility varying dramatically between the wet and dry seasons. The overall experience is one of immersion in a remote and ecologically rich biome. General facilities for paddlers, such as boat ramps and access points, are indicated to exist.