Clear Circles on the World Map by Main City #4

Oh no, the world map has been covered up with circles! To clear a circle you have to type a city inside it that is either:
A) one of the largest cities
B) one of the cities furthest from a larger city

Explanation of colours:
Big circles:
- blue indicates presence of capital cities
- red indicates lack of cities

City circles:
- red means it's not one of the largest
- green means it's not one of the furthest from a larger city

Dot size depends on number of circles cleared by that city