Oceania
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Oceania is the smallest continent by population among sovereign states and includes some of the tiniest countries in the world by both area and population — several Pacific micro-states routinely appear in "smallest country" superlative questions. Only Australia, among Oceania's fourteen countries, sits in the G20; none is a BRICS member, and New Zealand, despite its developed-economy status, has likewise never held G7 or G20 membership — a reminder that population and land area, not just economic development, drive bloc-membership questions, since New Zealand is more developed by most standard metrics than several G20 members.
Oceania — Capitals and Currencies
| Country | Capital | Currency |
|---|---|---|
| Australia | Canberra | Australian Dollar |
| Fiji | Suva | Fijian Dollar |
| Kiribati | South Tarawa | Australian Dollar |
| Marshall Islands | Majuro | US Dollar |
| Micronesia, Federated States of | Palikir | US Dollar |
| Nauru | Yaren (a district, not a formally designated capital — Nauru has no official capital) | Australian Dollar |
| New Zealand | Wellington | New Zealand Dollar |
| Palau | Ngerulmud | US Dollar |
| Papua New Guinea | Port Moresby | Papua New Guinean Kina |
| Samoa | Apia | Samoan Tala |
| Solomon Islands | Honiara | Solomon Islands Dollar |
| Tonga | Nuku'alofa | Tongan Pa'anga |
| Tuvalu | Funafuti | Australian Dollar (Tuvaluan dollar also issued as a parallel local currency) |
| Vanuatu | Port Vila | Vanuatu Vatu |
Nauru is a genuine exam trap worth remembering deliberately: it is one of the very few UN-member countries with no officially designated capital city — government offices are concentrated in the Yaren district, which is often listed as the capital in almanacs for convenience, but Nauru has never formally designated it as such. Several of the smallest Pacific nations use the Australian dollar or the US dollar outright rather than issuing their own currency, a practical response to populations too small to sustain an independent central bank and currency of their own.
Memory hook — "Oceania is Australia's currency zone": Kiribati, Nauru, and Tuvalu all use the Australian dollar; the Marshall Islands, Micronesia, and Palau all use the US dollar — group these six together as "the Pacific states that outsourced their currency," distinct from the seven Oceania countries listed above that issue their own.
Every one of Oceania's fourteen sovereign states except Australia itself is, geographically, an island nation — making Oceania, alongside South America and North America, one of the continents with no landlocked countries at all, but for a very different reason: it simply has no interior at all, only islands and one continent-sized island-country (Australia). Papua New Guinea shares its only land border with Indonesia (splitting the island of New Guinea between them) — the sole land border anywhere in Oceania — which is why "which Oceania country shares a land border with an Asian country" is a fair, if unusual, question, and the answer is always Papua New Guinea and Indonesia.