Juventae Chasma (Mars)

This feature is named after an earlier feature.

Juventae Chasma is an enormous box canyon on Mars which opens to the north and forms the outflow channel Maja Valles. Juventae Chasma is located north of Valles Marineris in the Coprates quadrangle and cuts more than 5 km into the plains of Lunae Planum. The floor is partly covered by sand dunes. There is also a 2.5 km high mountain inside Juventae, 59 km long and 23 km wide, that was confirmed by Mars Express to be composed of sulfate deposits. (wikipedia entry)

A chasma is a deep, elongated, steep-sided depression. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.