The Oodnadatta track is a 610km long unsealed ribbon linking Marla to Marree. It's a fairly easy drive and many people end up driving it with a 2WD. It takes you mostly across flat gibber plains, though there are also a few sand dunes along the way. I though it was pretty monotonous -yet not boring- after the grand sceneries we had encountered before.
A nice sight along the way was Blanche Cup, in the Wabma Kardabu Mound Springs Conservation Park. Many mound springs dot the area actually, and it's somehow disturbing to see those water wells amid the sun-baked plains around. Mound Springs are natural outlet for the Great Artesian Basin. Rain that fell 2.5 million years ago over what was to become Queensland and New South Wales is now exiting here in the South Australian Desert along cracks in the layer of impermeable rocks, due to pressure in the aquifer below.