Biggest World Cities within 200 Km (or 100), hints on dots

Name the cities that are more populous than any other within 200 kilometers (and some of the 100 km ones). When you type a city you will receive letters hints on nearby cities (within 400 km) that have a smaller population. To read the hints move the mouse over the small dots that will appear. You are shown letters from the second one onwards: the number of letters shown depends on the population (you are shown more letters for smaller cities)

Answers are sorted alphabetically; you are shown the first letter that is different from the previous answer and the number of nearby cities that can activate the hinted dot.