On the following map, the capital of country #7 is
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bogota
caracas
buenos aires
montevideo

On the following map, the capital of country #7 is Montevideo.

Explanation:

On the map, the country identified with # 7 is Uruguay, whose capital is Montevideo.

This city, besides being the capital of Uruguay, is its most populated city. It has a population of more than 1,400,000 inhabitants, over a national total of 3,500,000, so it can be said that more than a third of Uruguayans reside in the capital of the country.

In addition, if you consider its metropolitan area, this population amounts to almost 2,000,000 people.