This linear route follows the Ésera riverbank from Castejón de Sos to Llanos del Hospital, passing by Sesué, Eriste, Anciles and Benasque. It passes through Puro Pirineo MTB area lengthwise from South to North, and can be covered in its entire length or by segments. Between Castejón and Eriste there are some easy singletrack sections which can be considered as introduction to enduro. North of Benasque the route becomes gradually tougher,