Hebes Chasma

Hebes Chasma is an inclosed basin not connected to Valles Marineris. It is 319 km long (east/west, 198 miles), 130 km wide (north/south, 81miles) and up to 8km (5 miles) deep. Hebes Mensa, the bright region on the upper right side of the image, is a large deposit of layered material within the chasma. Extensive erosion has created gullies in the mensa and distributed fine sand size materials to create dunes and sand drifts. Hebes Mensa is 7.5 km (4.7 miles) high, 120 km (75 miles) long and 43 km (27 miles) wide.