The Neste Rioumajou is a single stream, 15.3 kilometers long, that starts in the Hautes-Pyrénées department, the town of Saint-Lary-Soulan.
It is located in the peripheral area of the Pyrenees National Park and classified as a Natura 2000 area and Natural Ecological Area of Interest Fauna and Flora (ZNIEFF)
It is a beautiful walk accessible to all, in bucolic landscapes, which has a long history of traffic route to Spain since ancient times.