Oceania

Oceania is a sub-planet of Earth comprising the continent of Australia, and the micro-continents of   Melanesia, Micronesia, and Polynesia, Oceania comprises all the Southerneastern Hemisphere, Oceania is the 3rd largest sub-planet of Earth after Afro-Eurasia and America, Oceania the sub-planet with most islands.

Australia
Australia is the most developed continent, and is the only continent in Oceania, Australia is one of the 3 developed continents, the other ones being North America and Europe, Australia is one continent, Australia is a fully-developed continent, and is the only continent with only 1 official language, Australia has a huge economy, and very huge development.

Melanesia
Melanesia is one of the 3 micro-continents of Oceania, Melanesia is a developing micro-continent, Melanesia is mostly poor and un-developed, Melanesia has no least-developed countries, but there are countries that are nearly Least-developed countries.

Micronesia
Micronesia is one of the 3 micro-continents of Oceania, Micronesia is the least micro-continent in Oceania, Micronesia has least-developed countries such as Kiribati, with lack of development, and huge poverty, and developed countries such as Guam and Northern Mariana Island with big economies.

Polynesia
Polynesia is one of the 3 micro-continents of Oceania, Polynesia is a paritally-developed micro-continent, with a mix of developed and developing countries, countries such as New Zealand has a huge development, and a very huge economy, and is a very developed country, and countries such as Samoa and Tuvalu have a lack of development, and have very poor economies.