Slovenia's rivers, lakes and Adriatic coast offers various water sports, from traditional boating for relaxation to adrenaline-inducing white-water rafting over waterfalls and rapids. Kayaking, canoeing, and rafting outings are possible on many Slovene rivers. Boats are available for rent on many lakes including Lake Bled and Bohinj. Cerknica Lake in the Karst region is an amazing natural phenomena of a sometimes 'disappearing lake'. It is a great favourite with windsurfers - when it has water in it! Yachts and sailboats rental is possible all along the coast. Proof of sailing qualifications is necessary, but yachts can also be hired together with an experienced captain.