![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Arima_Twins_%25288638973061%2529.jpg/640px-Arima_Twins_%25288638973061%2529.jpg&w=640&q=50)
Thaumasia Planum
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Thaumasia Planum er eit stort platå rett sør for Valles Marineris. Nedslagskrater med groper i midten og utkasta materiale frå somme av nedslagskratera tyder på at sletta ein gong hadde store mengder undergrunnsvatn eller -is.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Arima_Twins_%288638973061%29.jpg/640px-Arima_Twins_%288638973061%29.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Portion_of_central_pit_in_a_crater_on_Thaumasia_Planum_by_HiRISE.jpg/640px-Portion_of_central_pit_in_a_crater_on_Thaumasia_Planum_by_HiRISE.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Thaumasia_Planum_in_perspective_%288640075318%29.jpg/640px-Thaumasia_Planum_in_perspective_%288640075318%29.jpg)
Det er ei eldgamal lavaslette på Thaumasia Planum.