 It then passes Louhans and the Bresse area in the department of Saône-et-Loire, finally flowing into the Saône at La Truchère, a few kilometers south of Tournus.Near its mouth, the Seille forms a 3047 hectare network of ponds, dunes, and bogs, providing a habitat for a large number of migratory birds, including endangered species and rare plant species.The upper part of the Seille is a tranquil trout stream that sometimes overflows its banks in the spring.