What countries are there in Oceania?

Oceania is the smallest continent in the world; Apart from Antarctica, it is the least populated continent in the world. It is located in the vast sea area north and south of the equator in the central and south-central Pacific Ocean, between Asia and Antarctica, bordering the Indian Ocean in the west, the Pacific Ocean in the east and North and South America in the distance. Oceania has a total land area of about 8.97 million square kilometers, accounting for about 6% of the world's total land area, and is the smallest continent in the world. Apart from Antarctica, it is the least populated continent in the world.