Each Country is positioned in it's environment for reasons. Each terrain has it's own solemnity. Like Mist, calm waters, place where a fire, hurricane, tornado, or earthquake wouldn't occur.
And just as Ninja had said, the other ninjas would be able to prevent this and be able to put out any fires that occur. Deserts don't have very much earthquakes, fires, hurricanes, tsunamis either. The most that would happen there is a sandstorm. And fortunately, Wind Country Ninjas are used to those I would think.
Tsunami's wouldn't reach up to Water Country because they're higher leveled.
See where I'm going at?
Edit: Typo.