Either the abbreviation or full name can be accepted. [45] Snow is rare in Queensland, although it does fall with some regularity along the far southern border with New South Wales, predominantly in the Stanthorpe district although on rare occasions further north and west. With an area of 1,852,642 square kilometres (715,309 sq mi), Queensland is the world's sixth-largest sub-national entity, and is larger than all but 15 countries. The state's southern border with New South Wales is constituted in the east by the watershed from Point Danger to the Dumaresq River, and the Dumaresq, Macintyre and Barwon rivers. Major annual cultural events include the Royal Queensland Exhibition (known locally as the Ekka), an agricultural exhibition held each August at the Brisbane Showgrounds as well as the Brisbane Festival, which includes one of the nation's largest annual fireworks displays called 'Riverfire', and which is held each September. The capital and largest city in the state is Brisbane, Australia's third-largest city. While most early immigrants came from New South Wales, the first free immigrant ship to arrive in Moreton Bay from Europe was the Artemisia, in 1848. Since the Bjelke-Petersen era of the late 20th century, Queensland has received a high level of internal migration from the other states and territories of Australia and remains a popular destination for interstate migration. Queensland has the highest average maximums of any Australian state, and Stanthorpe, Hervey Bay, Mackay, Atherton, Weipa and Thursday Island are the only large population centres[