Porrentruy is a small town located in the Ajoie region of Switzerland. It serves as the capital of the District of Porrentruy in the Canton of Jura. Known for its historical architecture, the town features a charming old town area with buildings dating back to the Middle Ages. The town is surrounded by picturesque landscapes and offers various outdoor activities, including hiking and cycling. Porrentruy is also home to the Porrentruy Castle, which adds to its cultural significance. The local economy is supported by agriculture, tourism, and small businesses.