Leticia is an easy-to-navigate grid on the banks of the Amazon on the Colombia–Brazil border. Just across the frontier sits Tabatinga, a Brazilian town much the same size as Leticia, with its own airport and port that is the main gateway for boats downstream to Manaus. Visitors can freely move between the two cities as well as the Brazilian city of Benjamin Constant, 25km downstream, and the Peruvian island of Santa Rosa opposite Leticia/Tabatinga. Travelers wishing to venture further into either country must meet the immigration requirements.