Rivers can run for many hundreds of miles. The longest river in the world is the Nile in Africa. It is 6,700km long. The longest river in Britain is the River Severn, which is 354km long.

Fish

brown troutFish have stream-lined bodies to help them glide easily through the water. The predatory pike is especially slim to help it move fast when hunting its prey. It is well-camoulflaged as it lies in wait for a smaller fish to swim into its territory, which it then chases and seizes with its large, pointed teeth. The brown trout, a favourite with anglers, and the roach are both carnivorous fish, eating small invertebrates.

Can you find more examples of freshwater fish?

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