The Rio Embu-Mirim winds through the southwestern portion of greater São Paulo, Brazil, draining a mosaic of urban fringe, remnant Atlantic Forest fragments, and agricultural land before contributing its waters to the larger drainage system of the region. The river and its tributaries flow through municipalities including Embu das Artes and Itapecerica da Serra, passing through a landscape that reflects the pressures and complexity of one of South America's most densely populated metropolitan areas. Despite its urban context, the river corridor supports a surprisingly diverse assemblage of small native fish species, making it a point of interest for naturalist anglers and ichthyology enthusiasts alike.