I'm not sure I'd call it terrain, but I'm pretty sure he's talking about Pearce' airspace.
I wanted to say 15000' of granite would be easier to deal with than PEA ATC, but the truth is they are as cooperative as that can be. Its still a big chunk of airspace to work around though.
In breaking news, 24 ARRIVALS ARE BACK !!!!!
Ps Boomerang, the airlines flout METRON times, ASA cannot provide enough staff to keep the sectors open and PH airport have built one high speed turnoff to cope with a doubling of movements. I'm guessing you work in an office? If steps are being taken and the coalface don't notice, they I would politely suggest the steps aren't working.