Quite a few are volcanic in origin, but others are atolls or coral reefs. All fall under the geographical name "Oceania."
There are 20,000 to 30,000 islands in the South Pacific. These are known as the Pacific Islands. They are divided in 3 areas: Melanesia, Micronesia and Polynesia.
There are no South Pacific islands in Australia. Australia is a single country and continent in the South Pacific, but the South Pacific Islands are not within Australia. Australia should not be confused with the general geographical region known as Oceania.
Most of the Pacific Islands are low oceanic islands which formed from coral reefs.
The Cook Islands is in the south Pacific Ocean.
The large group of islands in the South Pacific is known as Oceania. These islands are classified as either the high islands or the low islands.
The Polynesian Islands are a loose group of atolls and islands in the south west Pacific: they are part of Oceania, which is not a continent, but a region.
Hawaii is a chain of islands in the Pacific.
The Galapagos Islands.
Galapagos Islands
The Solomon Islands are in the South Pacific.
The solomon Islands is one such chain.
Oceania