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Back in 1990, to promote the fully restored canal, Tim and Pru were invited to be the first boat in 42 years to travel the full length of the K&A. Almost a quarter of a century later, they navigate the 21 miles along its most picturesque stretch, starting in Bath and ending in Devizes.

Prunella and Tim travel the Rochdale canal, past once mighty mills, the epic beauty of the Pennines and the longest and highest canal tunnel in Britain.

Africa's landscape is sculpted by some formidable rivers and the Zambezi is one of the continent's mightiest. When the summer rains come to the valley, and fill the pools of the land buffaloes and elephants leave the river, but some animals, like the resident birds and spotted-neck otters, will always rely on this river - one of Africa's mightiest - the Zambezi.

Hidden between the mountains of Africa's Rift Valley flows a majestic river that brings an abundant surge of water to the Luangwa Valley. But after six months of no rain life for the animals becomes extremely desperate. Just as there seems to be no hope of survival, the clouds gather over the mountains and rain brings relief to the Luangwa Valley and its inhabitants.

One of Africa's most remarkable rivers spreads its waters over the desolate plains of the Kalahari Desert, forming the largest inland delta on earth, the Okavango. Fed by the summer rains that fall over southern Angola, the Okavango River flows into the heart of the desert in Botswana. As the water recedes, the desert reclaims its land.