ESA has published a photograph of a sort of labyrinth that is part of a region called Adamas Labyrinthus on Mars taken by the Mars Express space probe. This region is in turn part of Utopia Planitia, a huge impact basin with an estimated diameter of about 3,300 kilometers. The fractures in Adamas Labyrinthus create a system of polygonal shapes that might have originated from fine-grained sediments that were once at the bottom of an ocean.