You might change money, political system and even the time on your watch when crossing borders, but geography is hardly ever that abrupt, and so the fertile, green slopes of the Andes continue their northward march into Colombia. The mountains are a little lower, the valleys a little deeper, the vegetation a little lusher, and the indigenous presence a little less noticeable, but apart from that much the same. The southern mountains of Colombia house the country's most important archaeological sites, at San Agustin and Tierradentro, and so I decided, for the sake of completeness, to put on my Indiana Jones hat (which happens to be a rather funky kangaroo leather cowboy hat) and investigate.
| The Rio Magdalena valley near its source at San Agustin. The Magdalena is Colombia's largest river and bisects the country neatly in a south-north line before it reaches the Caribbean at Baranquilla. |
