Join 1 upcoming events being held in Castelsarrasin. Castelsarrasin is a charming city in southwestern France, located in the Tarn-et-Garonne department, known for its beautiful canal, picturesque half-timbered houses, and rich cultural heritage, including the 14th-century Church of Notre-Dame and the Jean XXIII square, making it an ideal destination for those seeking a relaxed and authentic French experience.