Australia is a continent and country in the Southern Hemisphere, known for its vast, isolated landmass, unique biodiversity, and diverse climates ranging from tropical rainforests to arid deserts. Its capital is Canberra, and major cities include Sydney and Melbourne. The country is characterized by its Outback, featuring large rock formations like Uluru, and the Great Barrier Reef, a famous underwater ecosystem. Australia is also a multicultural nation with a high standard of living and a thriving economy.