Rio Negro Cruise from Manaus to the Amazon River. Cruise down the Rio Negro to view the 'Meeting of the Waters', where the black Rio Negro and the muddy brown Amazon converge, on this full-day excursion from Manaus. This stretch of water, where the two differently colored rivers flow separately for a few miles, makes for spectacular photographs. E at lunch at a floating restaurant and stop to see the Victoria regia water plant at an ecological park, then take a motorized canoe up some of the Rio Negro's smaller tributaries. Book this Tour and Save 10%! Rio Negro Cruise from Manaus to the Amazon River.