The Rio Urubu flows through the heart of Amazonas state in Brazil, a remote and wild blackwater river deep in the Amazon rainforest. The river's notably acidic waters give it a dark, tea-colored appearance characteristic of blackwater systems, and this same acidity creates a fascinating side effect — the area is largely free of mosquitoes, making it a surprisingly comfortable destination for anglers venturing into the jungle. The river is home to a remarkable diversity of Amazonian fish species, and its remote jungle setting provides an immersive fishing experience unlike anywhere else on earth. Lodges and ecolodges situated directly on the river offer guided fishing excursions, making the Rio Urubu accessible even to visiting anglers unfamiliar with the region.