It is 394 km (245 mi) long and was named after Eugène Michael Antoniadi, a Greek astronomer (1870–1944) who spent most of his life in France.

When the sediments were later eroded away, the place where the river channel existed remained because the hardened material were resistant to erosion.

The inverted former stream channels may be caused by the deposition of large rocks or due to cementation.

An image below, taken with HiRISE of Antoniadi Crater shows sinuous ridges that are old channels that have become inverted.

[4] Inverted relief in the form of sinuous and meandering ridges, which are indicative of ancient, inverted fluvial channels, is argued to be evidence of water channels on the Martian surface in the past.