 To the south, its geographical limit is marked by the Ebro River, its border with the neighboring autonomous community of La Rioja.The Sonsierra of La Rioja includes the municipalities of Ábalos and San Vicente de la Sonsierra, located north of the Ebro River.Although geographically part of the river's left bank, these municipalities form a wedge of land technically belonging to the autonomous community of La Rioja.