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?

Context paragraphs:
Tarlo River: 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: 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.

Nattai River: 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.

Little River (Oberon): 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.

Macdonald River (St Albans): 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.

Little River (Wollondilly): 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.

Tuglow River: 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.

Tonalli River: 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.

Grose River: 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.

Coxs River: 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.

Supporting paragraphs: Grose River Nepean River
Answer: Australia