Pisuerga riversides in Alar Nature · Alar del Rey, La Ojeda, Palencia Image of Alar del Rey, not of the place itself. Kilometre zero of the Canal de Castilla is taken from the Pisuerga at the spot known as La Veguilla; between the natural channel and the canal a corridor of poplar groves and copses forms that accompanies the traveller as far as the locks. Photo: MottaW (CC BY-SA 4.0) What to see and do in Alar del Rey