I think the question being asked is WHY is it mountainous. The best answer I've seen is an ICAO thing that says more then 3000 feet change in 10 miles (I think). As far as I've seen there is nothing FAA specific for it, although it may be in the TERPS somewhere.
ACK... first flight info post... and I'm actually answering a question
Jepp considers mountainous terrain as terrain that rises X amount of feet above the airport reference point (ARP) within Y miles. This is different from the AIM. Unfortunately I forgot what X and Y were. Sorry.
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