That body of water is called the Torres Strait. A link to the Wikipedia article is included, and there is a nice map there.
The Coral Sea.
Torres Strait lies between Australia and Papua New Guinea.
The Gulf of Carpentaria lies between the Northern Territory and Queensland on Australia's northern coast.
The body of water between Australia's Cape York Peninsula and Papua New Guinea is Torres Strait.
The three seas which border both New Guinea and Australia are the Arafura Sea, Coral Sea and Timor Sea.The body of water between the northern tip of Australia and the southern coast of Papua New Guinea is Torres Strait.
The body of water which lies between Cape York Peninsula (northern Queensland) and the Northern Territory is the Gulf of Carpentaria.
There are no known man-made or natural underground aquifers that take water from New Guinea to Australia.
There are more than two straits in/around Australia. Torres Strait separates the northern tip of Queensland from Papua New Guinea. Bass Strait lies between the mainland of Australia and Tasmania. Clarence Strait in the Northern Territory separates Melville Island from the mainland of Australia. Endeavour Strait lies between the Australian mainland and Prince of Wales Island, which is in the far southern end of Torres Strait. Investigator Strait is the passage of water between South Australia's Yorke Peninsula and Kangaroo Island.
In the east, Australia and Papua New Guinea are separated by Torres Strait. The Western half of the island of New Guinea is separated from Australia by the Arafura Sea,
Australia and Papua New Guinea are separated by the Torres Strait. This body of water is very narrow and small.
The Sea World Resort and Water Park is located in the Australian state of Queensland. The address is, Sea World Drive, Main Beach, Gold Coast, Queensland 4217, Australia.
The Gulf of Carpentaria, off the northern coast of Queensland, Australia, is salt water.
Torres Strait.