Calakmul Long Circuit to Structure I and the Chik Naab Acropolis

The ruta larga begins at the signed trailhead beside the INAH ticket office at the end of the same 60 km paved access road off Federal Highway 186 at Conhuas that serves the rest of the Calakmul Archaeological Zone; the site opens at 08:00 with last entry at 16:00, and no fuel or ATM exists past Conhuas. Combined with the connecting section of the Grand Plaza loop, the circuit covers about 8 km of rolling forest floor with a single significant climb, a 50 m stone staircase up Structure I, the site's second great pyramid. The surface underfoot is mostly soft leaf litter over exposed limestone, with tree roots and patches of mud after rain, and the high canopy overhead keeps almost the entire route shaded except for the open plazas around Structure I and the Chik Naab acropolis. Landmarks along the way include the painted market murals and ball court of the Chik Naab acropolis, reached on the loop back from Structure I, with the pyramid summit serving as the natural turn-around point for walkers who do not want to continue the full circuit back to the Gran Plaza. There is no water, food service, or shelter anywhere on the route, so everything must be carried in, and there is no mobile signal for most of the walk. Wildlife sightings are frequent on this quieter section of the reserve, with spider monkeys, ocellated turkeys, and agoutis commonly encountered by walkers who set out at opening time before the heat builds.