Nice! I wonder if you could try and keep the number of letters "hidden" but you know in each section there's an answer for each length from 4 to 12, so that as you go along you get a hint on the length of the answers that are left. I think Turkmenistan/Ashgabat need to be swapped; also I thought Andes are longer than Himalayas. I wonder if "UralS" is more correct?
Thanks for the series!