This is a very good topic for a poem. I agree that you have to wonder where the places really are. My favorite lines are:

And when was sand ever

The colour of some

Putrid soft drink?

Nice contemplations.

I liked it. It was magical and dreamy - Sahara, Sahara... These words are so pretty. Sometimes I wish the English language was nicer and had such exotic names - nothing so boring as Smith or Franklin. You think of Washington, D.C. and it's just plain buildings with the huge White House - I mean, a white house! Then I think of other capitals and how nice they must be. I liked this poem because it set me thinking... sorry, not much of a review...