The GR 15 is a 165km-long marked walking route, that runs between the city of Vila Real de Santo António in the easternmost part of the Algarve and the village of Mértola in Alentejo. The Guadiana river is the route's connecting thread. From Alcoutim to Mértola there are two diferente itineraries, both suited to those who enjoy walking long streches at a time. This walkinh route is connected with te road to Sant James.
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