BBC presenters look back on their adventures throughout Indonesia and Mongolia, situated in earth's largest continent - Asia.

Steve Backshall looks back on one particularly unnerving adventure in Indonesia, a place very close to his heart, where he and his crew were chased by the world's largest venomous lizards - a group of ravenous, three-metre-long Komodo dragons. George McGavin, meanwhile, recounts a slightly more sedate adventure in Indonesia: the time when he filmed in a school for orangutans in the middle of the Sumatran rainforest.

Chris Packham also has fond memories of Sumatra, as he recalls how, in 1998, he took a batch of photographs of the Orang Rimba people, a group of hunter-gatherers who live in the rainforest. Wildlife cameraman Colin Stafford-Johnson also has an affinity with the archipelago; he looks back on his time spent filming Peanut, Hero, Tarzan and the rest of the monkeys that live on the island of Sulawesi.

From the lush islands of Indonesia in the south of the continent, we travel north to the vast lands of Mongolia. Wildlife camerawoman Sue Gibson was sent there a few years ago to film Pallas's cats in one of the most physically and mentally demanding shoots of her career. And Gordon Buchanan reminisces about his time filming Kazakh nomads, who hunt with golden eagles on horseback.

Our presenters look back on their wild adventures with some of nature's heavyweights across North America.

The continent has a very special place in Gordon Buchanan's heart. He once spent a year in the vast forests of Minnesota, getting to know a family of wild black bears. For Chris Packham, meanwhile, it's North America's coastal regions that are its greatest asset. He recalls a magical moment when a sperm whale popped up alongside his boat, as well as the time he got a little too close for comfort to a grey whale's blowhole.

Liz Bonnin recounts an even more bizarre adventure in North America, when she filmed alligators in Florida during their breeding season, while wildlife cameraman Colin Stafford-Johnson tells us about what he describes as one of his most luxurious shoots in North America, filming sea otters in the busy port of Monterey Bay.

Finally, Steve Backshall has had some of his most special filming moments in North America, including his time swimming with sperm whales in the Caribbean and seeing their immense intelligence in action.