Bahram Vallis is an ancient river valley in the Lunae Palus quadrangle of Mars at 20.7° north latitude and 57.5° west longitude.

It is about 302 km long and was named after the word for 'Mars' in Persian.

It is basically a single trunk valley, with scalloped walls in some places.

The presence of streamlined erosional features on its floor shows that fluid was involved with its formation.

This article about geology, geography or other features of the planet Mars or its moons is a stub.