NEW QUIZ: Great British Rivers

Where's the shortest river in the world? Which rivers have regular tidal waves? And which one is named after a nymph?

Discover all this and more while showing your flow of knowledge in our latest quiz.

This quiz celebrates the latest issue of Country Walking, where Nick Hallissey takes you on a journey from the source of a river to the sea.

This is your third of four chances to win one of 10 pairs of Bridgedale Bamboo Socks.

The socks are available in men's and women's specific fits and colours

The socks are available in men's and women's specific fits and colours

These socks are made using naturally silky, breathable and anti-microbial bamboo yarns and feature Coolmax fabric that wicks water away from the skin.

The socks are developed in partnership with the Plant A Boo(tm) Foundation - a campaign to fight global warming through increased bamboo cultivation.

Click on the window below to get started and answer the Prize Question at the end for your chance to win.