The Gregory Rift appears at its most majestic a short distance northwest of Nairobi where the valley trough narrows to just fifteen miles across. From its eastern wall above the rock-strewn Kedong Valley, the ancient volcanos of Suswa (left) and Longonot (far right) can be seen as reminders of a turbulent volcanic past that shaped the Rift Valley landscape over 25 million years. Now in a dormant phase, which may last many thousands of years, these volcanos are by no means dead. Steam can be seen issuing from the inside wall of Longonot's Crater to this day.