This image, taken by HiRISE, shows a lobate tongue on the northwest Hellas rim.
Lobate features such as these are located in the mid-latitudes (30-60 degrees), indicative of viscous flow, are reminiscent of terrestrial glaciers and have long-been interpreted as evidence for subsurface ice.
Recent ground-penetrating radar observations by SHARAD of other lobate features in this latitude belt also support the notion that these features have cores with ice.
Photo credit: NASA/JPL/University of Arizona
Note: This landscape is located somewhat to the northeast of Hellespontus Montes.