The Okavango Delta is a huge inland lake, some 15,000 km wide in the north of Botswana. It offers the unique spectacle of a full African safari on the water viewed from an aluminium boat crisscrossing the shallows and charging through the elephant grass. I camped on deserted islands in the middle of the Delta, listening to honking Hippos at night and the roar of uncomfortably close lions. The birdlife is equally astonishing, but the real adrenaline rush occurs when you come across a large animal blocking your wayThis happened on two occasions, the first being with a highly dangerous Hippo, which we had surprised and fortunately out manoeuvred. The second occasion was with this adolescent bull elephant which blocked our progress in the middle of a narrow channel. It threatened, roared and then charged. I quickly pressed the shutter and then luckily it fled at the sound of our accelerating engine.