The body of water that separates Australia from Asia is the Arafura Sea. This sea lies between the northern coast of Australia and the southern coast of New Guinea. It connects to the Timor Sea to the west and the Coral Sea to the east. This geographical feature creates a distinct separation between the two landmasses, impacting their ecosystems and climates. Additionally, the Arafura Sea is part of the broader marine environment known for its rich biodiversity and fishing grounds, making it significant both ecologically and economically for the region.