Tags: Crater.
Niger Vallis is a valley on Mars that appears to have been carved by water. It has been identified as an outflow channel. It merges with Dao Vallis which runs southwestward into Hellas Planitia from the volcanic Hadriacus Mons. Like Dao it was formed around the Late Noachian and Early Hesperian Epochs. It is named after the Niger River in Africa.
