The Rio Tocantins is one of Brazil's most celebrated rivers, stretching approximately 2,500 kilometers (1,553 miles) from its headwaters in Goiás through the states of Tocantins, Maranhão, and Pará before merging with the Amazon River system near Belém. As the second largest river entirely within Brazil, the Tocantins is a world-class destination for anglers seeking hard-fighting tropical species in a setting of extraordinary natural beauty. The river is characterized by a dramatic mix of fast and slow waters, with crystal-clear, rapid-filled stretches alternating with calmer pools and flooded plains. The archipelago known as Tropeço — comprising 366 islands and ranking as the third largest river archipelago in the world — is one of the most visually stunning and productive fishing environments along the river's course. The Tocantins basin supports more than 350 registered fish species, including over 175 endemics, making it a biologically rich and unique fishery despite being considered modest by broader Amazonian standards.