End of the North Branch of the Canal de Castilla Historical milestone · Alar del Rey, La Ojeda, Palencia Image of Alar del Rey, not of the place itself. The North Branch of the Canal de Castilla, 75 kilometres and 24 locks between Alar del Rey and Calahorra de Ribas, was completed in August 1791; it was the first finished stretch of a work begun in 1753. 1791 Photo: Alberto San Millán Suances (Albermola) (Public domain) What to see and do in Alar del Rey