The document discusses trekking along routes near the Ebro River in Spain. It provides details about trekking as an adventure sport that can be done year-round. It describes the GR 99 route along the Ebro River from Alagon to Utebo that takes hikers through areas like the Soto de Malfora and river meanders. The document outlines how to follow the signs along the route and notes plants and landscapes seen along the way, including daisies, crops, poplar forests, reeds, and the widening river at loops.