By Dora Montero In June 2023, where the Caquetá River leaves Colombian territory and enters Brazil, no more than 35 kilometers (21.7 miles) from the border, Custodio Yucuna Tanimuca came across a group of soldiers stranded in the Córdoba stream, one of the most feared rapids in the tributary even for the most skilled navigators. The soldiers asked the Indigenous resident, health promoter and leader of the Yucuna ethnic group, born in the Curare Los Ingleses Reserve, to help them cross the stream on his boat. Skilled in such matters, like almost all those who grew up navigating the tempestuous …