This article describes images taken by a high resolution stereo camera on board the Mars Express which have captured a channel system at the mouth of the Tiu Valles on Mars. This landform is unique in that it displays characteristics typical of the tidal effects found in an estuary on Earth. The exact geological processes that formed these landforms remain unknown. A possible explanation is that during floods, water or water-rich surface layers contacted lava from surrounding areas and formed the mysterious ridges. The landforms of the Tiu Valles also contain large-scale massifs, or large relief masses that have moved and weathered as a block. These particular massifs are heavily eroded. The Tiu Valles terminate in the Chryse Planitia plain.
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