Australia, the smallest continent and one of the largest countries on Earth, lies between the Pacific and Indian oceans in the Southern Hemisphere. It is separated from Indonesia to the northwest by the Timor and Arafura seas, from Papua New Guinea to the northeast by the Coral Sea and the Torres Strait, from the Coral Sea Islands Territory by the Great Barrier Reef, from New Zealand to the southeast by the Tasman Sea, and from Antarctica in the far south by the Indian Ocean. Australia is often called "Down Under" because the whole continent lies south of the equator.