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Mark Stone

Startrails over the Okavango Delta, Botswana, captured in a long exposure. The soundscape of this environment – often considered one of the last truly wild strongholds of Africa – is one of those captured by audio recordist Martyn Stewart as part of his Nature Sounds archive.

Mount Rainier is an active volcano and the highest peak in the Cascade Range.

The Milky Way above an expedition campsite in the Okavango Delta.

The Milky Way dazzles above the Himalaya, a mountain range that stretches 1,500 miles across Asia. Thirty of the world's highest mountains are in the Himalayan range, including Everest, the tallest peak on Earth.