The largest open road cyclosportive in the UK is the "Verenti Dragon Ride Wales", held each June over a challenging 200 km mountainous course in South Wales. There are three UK cyclosportives held on closed roads: the annual "Etape Caledonia" which attracted some 3,500 cyclists in its 2009 edition, follows a route around the Perthshire highlands; the "Etape Cymru", first held in October 2011 on North Wales roads including the Horseshoe Pass; and the Prudential RideLondon-Surrey 100 through central London and the Surrey countryside, which in its inaugural run in 2013 was completed by nearly 16,000 riders, and by over 20,000 the next year.