The mighty Nile, the sacred Ganges, the Amazon, the Mekong and the Sepik are all great rivers on Earth, and they all have played a role in shaping the landscape, and human history and culture. We also explore Plitvice Lakes in Croatia, an underground river flowing through Waitomo Caves in New Zealand plus some of the greatest waterfalls on earth: Angel Falls, Victoria Falls and magnificent Iguazu.