Petra overrated ? WTF ? A desert with just ONE oasis and even no hills makes Petra worth it as all tiles around the oasis will benefit from petra\irrigation\admi farm bonuses. So for ONE oasis that can lead to a whooping 7F/7H bonus. Once found a location with 2 oasis, 3/4 mountains and even lake victoria in range. Turned out to be a complete mayhem. Only sad part is i rolled that map for the chieftain challenge which bored me to death after 100 turn.