The UK's Royal Marines' famous 30-mile speed march in basic training, is undertaken in which National Park?

Royal Marines recruit training is the longest basic modern infantry training programme of any Commonwealth, or North Atlantic Treaty Organisation (NATO) combat troops. The Royal Marines are the only part of the British Armed Forces where officers and other ranks are trained at the same location, the Commando Training Centre Royal Marines (CTCRM) at Lympstone, Devon. Much of the basic training is carried out on the rugged terrain of Dartmoor and Woodbury Common with a significant proportion taking place at night.

The 30-mile speed march is a 30-mile (48-km) march across upland Dartmoor, wearing full fighting order, and additional safety equipment carried by the recruit in a daysack. It must be completed in eight hours for recruits and seven hours for Royal Marine officers, who must also navigate the route themselves, rather than following a DS (a trained Royal Marine) with the rest of a syndicate and carry their own equipment.