The Ulla is a river in Galicia, Spain.
Its source is sometimes given as Antas de Ulla and sometimes the neighbouring municipality of Monterroso. It flows to the Ría de Arosa estuary near the city of Catoira. Its basin is the second largest in Galicia after the basin of Minho River. Tributaries include the rivers Deza and Arnego.
The river is valued by archaeologists owing to the large number of neolithic artefacts found there. From Wikipedia
