On opposite sides of the Tasman Sea, Australia and New Zealand both share British colonial heritage and the English language. They fall within the area commonly known as Australasia, meaning south of Asia, which includes Tasmania, New Guinea, and other islands in the Pacific Ocean. There are strong economic ties between the two countries and, although their cultures differ, they have been known to come together as one force, an instance of which is the Australian and New Zealand Army Corps during the Boer, First and Second World War.