The Tarlo River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Southern Tablelands and Southern Highlands regions of New South Wales, Australia.
Nepean River (Aboriginal: Yandhai), is a major perennial river, located in the south-west and west of Sydney, New South Wales, Australia.
 The Nepean River and its associated mouth, the Hawkesbury River, virtually encircle the metropolitan region of Sydney.
The Nattai River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Southern Highlands region of New South Wales, Australia.
The Little River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Central Tablelands region of New South Wales, Australia.
The Macdonald River is a perennial river located in the Hunter and Outer Metropolitan Sydney regions of New South Wales, Australia.
 It is a part of the Hawkesbury-Nepean catchment.
The Little River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Southern Highlands region of New South Wales, Australia.
The Tuglow River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Central Tablelands region of New South Wales, Australia.
The Tonalli River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Blue Mountains region of New South Wales, Australia.
The Grose River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Blue Mountains region of New South Wales, Australia.
The Coxs River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Central Tablelands, Blue Mountains, and Macarthur regions of New South Wales, Australia.

Question: The Grose River, a perennial river that is part of the Hawkesbury-Nepean catchment, the Nepean River, is a major perennial river, located in the south-west and west of Sydney, New South Wales, in which country?
Answer: Australia