Which canyon is known for its unique slot canyon formations?

Which canyon is known for its unique hoodoos rock formations? What is the name of the famous canyon in Australia, known for its red sandstone walls? Which river carved out the Taroko Gorge canyon in Taiwan? In which country is the Colca Canyon located? What is the name of the famous canyon in South Africa, known for its lush vegetation? What is the name of the canyon carved by the Green River in Utah? In which country is the Tiger Leaping Gorge canyon located? In which mountain range is the Colca Canyon located?