They're both mountains and has a river flowing between the mountain
Valleys.
In many cases, rivers are responsible for cutting valleys and canyons.
That is the correct spelling of the plural noun "canyons" (mountain valleys).
Pluto has only been observed from orbit, so we don't know for sure, but it does appear from photos that there are valleys and canyons.
v
deep sea canyons
there are some in canyons and some in valleys
V-shaped valleys in the continental shelf and slope are called submarine canyons. These are deep, steep-sided valleys that cut across the continental margin and are often formed by underwater processes such as turbidity currents or erosion by underwater currents. Submarine canyons can be comparable in scale to canyons found on land.
valleys, hills, mountains, plateaus, cliffs, canyons, and valleys
Canyons and sand dunes are landforms created by the action of wind and water erosion. Both features are formed over time through the erosion and transportation of sediment. Canyons are deep valleys carved by rivers, while sand dunes are large mounds of sand shaped by wind.
valleys and canyons are sometimes created by glaciers.
Fault-Block Mountains Valleys or canyons