Australia is a country and a continent in the South Pacific on Earth. It is located just under 3,000 miles west of Fiji.
When H.A.R.M. issued their list of demands in The Operative: No One Lives Forever, one of the items listed was the entire continent of Australia.
Towards the end of No One Lives Forever 2: A Spy in H.A.R.M.'s Way after the failure of Isako and Pierre the Mime King to eliminate Cate Archer, The Director wondered why they hadn't hired a hitman known as The Australian (who was obviously from Australia).
Australia on Wikipedia