sentences:  The Oise borders the town on its north and west sides, and the town is partially built on three islands, the Ile du Prieuré, the Ile de la Cohue and the Ile de la Dérivation, by which there is a dam and lock.Several small streams flow through the town and there are also ponds and small lakes in the vicinity.The town is liable to flooding when the river rises, and nowhere in the commune is higher than above sea level, the river being at above sea level.