I was thinking about this too! I seem to remember Uzuldaroum was eons post Hyperboria in CAS' cannon and a part of the Zothique Setting. I imagine that is why Jeff left it off map. still I will definitely be using it in my game because I have such a strong mental image of the place.
"We alone of all mankind, who are sorcerers of high attainment and mastery, may endure the lethal ice-change and become breathers of the airless void, and thus, in the end, be made suitable for the provender of such as Rlim Shaikorth." sounds great unless you know what Provender means.