What is the name of the famous canyon in Australia, known for its red sandstone walls?

In which state is the Black Canyon of the Gunnison located? What is the name of the famous canyon in Arizona, USA, known for its blue-green waters? In which country is the Fish River Canyon located? Which canyon is known for its unique hoodoos rock formations? Which river carved out the Taroko Gorge canyon in Taiwan? In which country is the Colca Canyon located? Which canyon is known for its unique slot canyon formations? What is the name of the famous canyon in South Africa, known for its lush vegetation?