Santullano is one of six parishes (administrative divisions) in Las Regueras, a municipality within the province and autonomous community of Asturias, in northern Spain.The population is 358 (INE 2015).Villages Andallón (Andayón) Ania Lazana (Llazana) Otero Santullano de Las Regueras (Santuyanu Les Regueres) Trascañedo (Trescañeu) Viado (Viáu)