The Bayas () or Baia () is a river of Spain. From its source in the Gorbeia massif in Biscay, it flows southwards through Álava before discharging into the Ebro River near Miranda de Ebro, Burgos. See also Orthotrichum casasianum – an endemic species of moss growing in trees on the banks of the river References External links Rivers of Spain Rivers of the Basque Country (autonomous community) Rivers of Castile and León Rivers of Álava Rivers of Biscay Rivers of Burgos Natura 2000 in the Basque Country (autonomous community) Tributaries of the Ebro