All 1M Cities enclosed by 1M City Pairs within 2,000 km
Type two 1M cities A and B one after the other and 1M cities 'in between' will appear. 1M City C is considered between the two if:
- the distance between A and B is at most 2,000 km - A is considerably closer to C than to B - B is considerbaly closer to C than to A - 'considerably closer' means the shorter distance is at most 52.5%-55% of the longer one (the value depends on the number of possible pairs) The 124 1M cities that aren't "between" any pair must be typed individually; you can recognize them because their dot is externally white.
You will have to type the 2 cities in alphabetical order! Example: typing BERLIN-PARIS will get you Frankfurt and Mannheim
UrbanArea population according to citypopulation.de (ref. date 1.1.19)
Dot colours: blue represents a capital, dark blue an agglomeration including a capital, red represents an agglomeration without a main city