Use clues to identify location. The clues are: (1) the capital (see caveats) (2) the continent where the answer is located; and (3) an indication of whether the answer is a sovereign state.
Source: Wikipedia List of national capitals.
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Oceania, for the purposes of this quiz: the Pacific region between mainland Asia and the Americas, including Australia and New Zealand; but excluding Japan, Taiwan and the Malay Archipelago.
For sovereign states with multiple capitals, only one is given, with precedence as follows. 1. The de jure or constitutional capital, if one exists; else 2. The official or declared capital, if one has been designated; else 3. The executive or administrative capital.
For sovereign states with no official capital, the de facto capital is given.
For non-sovereign states, the de facto capital is given.