Valence-sur-Baïse is a city in the Gers department of the Midi-Pyrénees region in France. It is near Condom-en-Armagnac. It was founded in 1274 by Gerald V, Count of Armagnac, and the Cistercian Abbey of Flaran as a Bastide (a fortified city). In 1999, 1151 people lived there. There is an old cisercian abbey at the place. Today the abbey serves as a cultural center. There is also a public washing basin, and a port, where ships can land.