The main quarter of the town is located on the right bank of the Lot River and is linked to the quarter on the left bank by a bridge from the 13th century, the principal arch of which, constructed during the reign of Louis XIII in place of two older arches, has a span of and a height of . On the left bank, portions of the 13th century ramparts, altered and surmounted by machicolations of the 15th century, remain, and high square towers rise above the gates to the north-east and southwest, known respectively as the Porte de Paris and Porte de Pujols.