Europe, a continent of 50 countries, famed for cities and ancient civilizations, home to some 700 million people, and yet with a staggering diversity of natural wilderness teeming with wildlife.
The fourth leg of the broadcaster's journey takes him from Oman to the Maldives. He starts in the Strait of Hormuz, where oil from the Gulf is shipped through the narrow channel, then moves on to Mumbai, the ocean's biggest port. In the Maldives, Simon finds arguably the most beautiful collection of tropical coral islands in the world - but the fragile underwater environment is a barometer for the changing nature of the sea, as he witnesses how bleaching has damaged the coral and one entire island has been manufactured as a landfill dump to deal with the problem of rubbish.
The odyssey continues as Colin Stafford-Johnson completes his journey along Ireland's Atlantic rim. Exploring the wildlife and mountains around his home inlet of Clew Bay, Colin then heads north for Donegal - golden eagle country - before reaching the island's northern tip and turning east along the coast of Northern Ireland.
In the far south west of Japan, there is a chain of islands stretching towards the tropics - a place where all life is influenced by the power of the sea, and where volcanoes and typhoons are forces to be reckoned with. The journey begins at an island at the top of the chain and travels south, revealing unexpected stories of isolation, unique wildlife and unsolved mysteries.
Joanna travels the length of India, including footage of her encounters with the flower-sellers of Madurai, before taking?us back to Uzbekistan, where she reveals some gory tales of the country's history and discovers the secrets of gem-making.
Modern-day China has been built on the traditions and innovations of the past. In this aerial journey, explore the sprawling nation from a whole new perspective. See how nature has served as both an enemy and an ally, and meet people who have built lives in the unlikeliest of places, from steep river valleys to harsh desert landscapes. It's a coast-to-coast tour of a vast and varied nation, where ancient customs continue to shape the landscape and the people.
Simon Reeve sets out on an epic journey around the island of Ireland - a place steeped in history, culture and belief, but with a complex past. Part 1: South Simon begins his journey in the south of Ireland, paramotoring with an Irish explorer. On the west coast, he does spot of surfing before climbing Croagh Patrick in honour of Ireland's patron saint. This leg of his journey ends in Malin Head, Ireland's most northerly point.