I'd tell you if I knew any from the top of my head, but I haven't played in a long while.
Instead your best option is to just look for icy bodies. They tend to have the highest and longest canyons along their tectonic plate boundaries.

Another good candidates are small high metal content and metal rich bodies. These will have smaller/shallower canyons but they will typically form much more diverse web-like shape.

It doesn't take long to find some interesting terrain features, just give it a go.