Mars may seem to be an alien world, but many of its features look eerily familiar—such as this ancient, dried-up river system that stretches out for nearly 700 kilometres across the surface, making it one of the longest valley networks on the planet.
![](https://scx1.b-cdn.net/csz/news/tmb/2019/riverrelicsp.jpg)
Source:
https://phys.org/news/2019-10-river-relic-spied-mars.html