Many trails are marked on maps. Typically, a long-distance route will be at least 50 km (30 mi) long, but many run for several hundred miles, or longer.
Many routes are waymarked and may cross public or private land and/or follow existing rights of way. Generally, the surface is not specially prepared, and the ground can be rough and uneven in areas, except in places such as converted rail tracks or popular walking routes where stone-pitching and slabs have been laid to prevent erosion. In some places, official trails will have the surface specially prepared to make the going easier.
GR footpaths are long-distance footpaths in France, Belgium, the Netherlands, Spain and Portugal (the Grande Randonnée (French), Grote Routepaden or Lange-afstand-wandelpaden (Dutch), Grande Rota (Portuguese) or Gran Recorrido (Spanish)).