World capital superlatives

The clues in this category pertain to capital cities of U.N. member nations.

(3/-1) By far, it's the most populous capital city in North America.9230
(6/-2) This southernmost world capital is also extremely windy because of the Roaring Forties that move through the Cook Strait.8285
(9/-3) The world capital with the lowest elevation is this Azerbaijani capital on the Caspian Sea, 28 m below mean sea level.77117
(12/-4) These two capital cities of African countries named for the same river are just 2 miles apart.60134
(15/-5) From the small world capitals department: Melekeok State, with population 277, contains Ngerulmud, the capital of this country whose capital was once Koror City.28364

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