Seven Natural Wonders of the World

Remember that poll to determine the new seven wonders of the world? Well, the same group is sponsoring a new poll. This one is to determine the top seven natural wonders of the world. They're still in the nomination phase.
My guesses?

• Mount Everest
• The Grand Canyon
• The Amazon
• Ayer's Rock
• The Great Barrier Reef
• Victoria Falls
• The Harbor of Rio de Janerio

Some alternates?

• Lechuguilla Cave
• Iguazu Falls
• Selma Hayek
• The White Cliffs of Dover
• Mt Ranier
• Zhelin Reservoir

Any other suggestions?