This is where the walk starts. It is now possible to walk off road the entire way from Tarifa to Athens. Here's a bit of background I got off the net: The letters GR stand for "Gran Recorrido" (Long Journey). The GR7 is the footpath through Andalucia, which forms part of the European Route No. 4. The route is made up of itineraries, which are designed to avoid crossing or using tarmac roads or any roads used by traffic, wherever possible. The origins of the long European Route No.4 or E4 (totaling over 10,500 kilometres) come from the time, centuries ago, when man moved away from the seashores to explore living inland, marking the start of the hunting and gathering evolution, which later developed into the first farming and agricultural societies.The extensive footpath is based on this ancient trade route and it offers us an opportunity to walk the length of Europe. It begins at Tarifa, in the Straits of Gibraltar and after crossing the coastal mountains of Spain; it carries on across the Pyrenees, France, Switzerland, Austria, Hungary, Rumania and Greece.