Pluto's moon Charon features a massive, deep chasm
 

While humans are still a long way away from going canyoneering on the moons of Pluto, we can at least start scoping out the terrain. In images shot last summer by NASA's New Horizons spacecraft, we can see one immense and interesting feature of Charo...

https://www.engadget.com/2016/06/24/...ve-deep-chasm/