At L'Isle-sur-Serein, the river divides to encircle the tranquil little town and the ruins of its 15th-century chateau.
The river runs right through the town at L'Isle-sur-Surein.
mnli hypothesis: The river runs right through the town at L'Isle-sur-Surein. premise: At L'Isle-sur-Serein, the river divides to encircle the tranquil little town and the ruins of its 15th-century chateau.