Photographer David Clifford has captured the world's most dogged runners doing what they love in the most remote and unforgiving environments.
Tunisia
Hours of daylight: 10hrs
Hours of sunshine: 6hrs
Maximum temperature: 20C
It's like Turkey, Morocco and Egypt rolled into one - a mix of north African and Mediterranean influences. With fewer tourists than the other countries and a more comfortable climate, wintertime is perfect for exploring Tunisia. Discover the museums, filled with artefacts from local excavations, and visit Sousse, a Unesco world heritage site where you will find a labyrinth of winding alleys and historic buildings.
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