Final answer:
The correct answer is a. Lake Mackay. Lake Mackay is not a river in Australia; it is actually a salt lake located in the Western Desert of the Northern Territory and Western Australia. Lake Eyre, c. Victoria River, and d. Murray River are all rivers in Australia.
Step-by-step explanation:
The correct answer is a. Lake Mackay. Lake Mackay is not a river in Australia; it is actually a salt lake located in the Western Desert of the Northern Territory and Western Australia.
Lake Eyre, c. Victoria River, and d. Murray River are all rivers in Australia. Lake Eyre is the largest lake in Australia, located in South Australia, while Victoria River and Murray River are major rivers that flow through different parts of the country.
So, the only option that is not a river is a. Lake Mackay.