"remote terrain" is correct and usable in written English.
You can use it to refer to geographically isolated land, for example, "Due to its remote terrain, this part of the country is difficult to access."
It often takes American officials some time to determine the success or failure of attacks by remotely piloted aircraft in the rugged and remote terrain of the tribal areas.
He was found relatively easily in remote terrain in a couple of hours.
Some immigrants were said to be hiding in even more remote terrain.
Today Ed and Stanley Gelvin, father and son, are planning to prospect in a stream in high remote terrain.
Eliminating him may be hard; with the backing of his bellicose tribe, in remote terrain, Mr Mehsud is a more formidable militant than those in Swat.
The Americans placed a $5m dollar bounty on him, but his position appeared relatively secure, as he was backed by a bellicose tribe in remote terrain.
These potentially dangerous oil drilling expeditions in remote terrains yield an insignificant amount of oil at best.
It is the lines of force from history and economics and human contingency that intersect and overlap in his atmospheric guide to a still-remote terrain.
"Proof" reaches into remote cerebral terrain and finds -- guess what?
Without any baffling erudition, "Proof" reaches into remote cerebral terrain and finds -- guess what?
Alyson Teeter of the California Air National Guard, which took two survivors to the hospital, said the crash scene was in relatively remote, rugged terrain.
