The Meeting of Waters, located near Manaus in Brazil’s Amazon region, is a striking natural phenomenon where the Rio Negro and the Rio Solimões converge. Visitors can take boat tours to witness the dramatic contrast between the dark, tea‑coloured waters of the Rio Negro and the sandy‑brown currents of the Solimões flowing side by side without mixing for several kilometres. Notably, this spectacle occurs due to differences in temperature, speed, and density between the two rivers, creating one of the most iconic sights of the Amazon and a gateway to exploring the vast rainforest ecosystem.