http://www.sciencemag.org/news/2021/02/after-dramatic-landing-mars-rover-will-probe-ancient-lake-clues-planet-s-wet-past

A panorama taken on 20 February showed Perseverance’s target—the edge of a fossilized river delta—looming on the horizon.

Last week, NASA’s $2.7 billion Perseverance rover made a picture-perfect landing on the floor of Mars’s Jezero crater, which scientists believe was filled to the brim with water 3.8 billion years ago. Two kilometers away looms the rover’s primary target: a fossilized river delta, created as muddy water spilled into the crater—ideal for preserving signs of life.