Blackmoor 20
Dark Sun 13 + 1 = 14 The very environment is being harsh to my favorite; here is a cache of water.
Eberron 13
Greyhawk 20
Jakandor 11
Kingdoms of Kalamar 18
Lankhmar 20
Mahasarpa 6
Mystara 21 - 2 = 19 Expose the leader to the omnipresent desert, a little bit.
Spelljammer 18