<prompt> Translate the following text to SwahiliAt LIsle-sur-Serein, the river divides to encircle the tranquil little town and the ruins of its 15th-century chateau.  <response>: Huko LIsle-sur-Serein, mto huo unagawanyika na kuzunguka mji huo mdogo wenye utulivu na magofu ya ngome yake ya karne ya 15. 