Curiosity arrived more than a year ago on Mars and roved right onto an ancient riverbed.

Ahead, an ancient riverbed wound through the Underworld.

Scientists already know that Curiosity's explorations have taken it to a place that was basically an ancient riverbed.

Already, it has seen the remains of an ancient riverbed system, where water once flowed perhaps a metre deep and quite vigorously.

Almost immediately, the rover uncovered evidence that the place was an ancient riverbed, with a long and complex history of flowing water.

You can also find areas of interest, such as Yellowknife Bay, which Curiosity determined was an ancient riverbed, and the rover's landing site at Bradbury.