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The 22,835 mile long Tropic of Cancer marks the northern border of the Tropics, the region of the planet with both the richest natural biodiversity, and the greatest concentration of human suffering.

Tropic of Cancer marks the culmination of Simon Reeve's TV journeys around the Tropics, together comprising more than five years of research and filming.

The new series investigates poverty, the drugs trade, climate change, industrial pollution, and a forgotten war - but it is also a spectacular travelogue.

Simon circles the planet, crossing the Sahara, the deserts of Arabia, the jungles of Asia, and borders of North Africa that have been closed to foreigners for decades.