A small river island which possesses a relatively rectangular shape, about 300 m of length from north to south and 40 m of wide from east to west; all in all, the island measures approximately 10 700 m. The island of the Devastating occupies a kind of indentation in the southeast of the island saint-Catherine. She is connected with her by two pedestrian footbridges, the footbridge of Pie who also crosses the Marne and allows to reach its oriental bank (and to Saint-Maur-des-Fossés) and the second footbridge, smaller, nearby. A very wooded park reserved for the pedestrians covers all of the island.