Guadalajara is a city of more than five million people in a metropolitan area spread across a plateau at 1,566 metres. The image you form is of a flat urban expanse with no relief, and it is accurate until you reach the northern edge.
There the plateau ends. It does not fade out or turn into hills: it is cut off. And on the other side of the cut there is half a kilometre of air.
01 The city ends in a precipice
The Huentitán canyon occupies some 1,136 hectares north of the Guadalajara municipality, on the boundary with Tonalá, Zapotlanejo, Ixtlahuacán del Río and Zapopan. It was cut by the Santiago river, the same one that leaves Lake Chapala a few kilometres to the south.
In some stretches the walls reach 600 metres. At the point where the old funicular ran, the difference between the upper level, at 1,520 metres, and the lower, at 1,000, is 520.
The striking part is not the figure but the position. You get there on city transport, cross the last street and start going down. There is no transfer, no national park two hours away: it is stuck to the city.
Five hundred and twenty metres of drop between the last street and the river: the city does not end in wasteland, it ends on a ledge.
02 Five hundred and twenty metres down
The classic route is the descent from the viewpoint to the floor and the return by the same path. It is some 520 metres of drop in each direction, on a track that is cobbled along much of its length.
Going down, most people take between an hour and a half and two hours, with stops. Coming back up, two to three, depending on fitness and, above all, on the time of day the climb begins.
The descent is not technical. It is continuous and sustained, with stepped sections and a lot of loose ground where it is not cobbled, so it punishes knees more than lungs. The climb is exactly the opposite.
03 Another climate at the bottom
The 520 metres are not only effort: they are a change of climatic level. The city sits at 1,566 metres and the canyon floor at around 1,000. That difference translates into several degrees warmer below than above, every day of the year.
And the vegetation shows it without needing a thermometer. Above there is oak woodland and plateau scrub; below, canyon vegetation, denser, greener and with species that would not survive the plateau's winter.
The walls, moreover, are a geological section at full scale. The pale horizontal bands running across them are lava flows stacked one on another, each from a different eruption, which the river has cut through.
04 The river to look at and not touch
It is worth being clear about this because it affects the plan. The river at the bottom is the Santiago, which leaves Chapala and collects, upstream, the drainage of an enormous basin with agricultural and industrial activity.
The result is visible from the viewpoint: the water runs brown. The canyon is an excellent walk, but it is not a place anyone swims, and it is worth knowing that before going down with the idea.
What there is at the bottom is a stretch of dense vegetation, shade and a track that follows the river. The reward of the descent is being at the bottom of the cut and seeing the walls from inside, not the water.
05 The climb, which is the real trip
Everyone who has done this walk says the same thing: the descent deceives. You go down easily, reach the bottom in a couple of hours and only then realise that you have to redo the 520 metres with the sun already high.
Hence the rule that organises the plan: start at dawn. Going down at seven and being back by midday turns a hard day into a good morning. Starting at eleven turns it into something else.
And hence the choice of month too. In April and May, the city's highs are 30.5 and 31.9 degrees, and it is hotter on the canyon floor. From October to February they stay between 24.1 and 26.7, which is another matter.
Water: carry all of it. There is no reliable source on the route and the river is no use. Reckon on at least two litres per person for the climb.
06 How to build the day
The canyon takes a whole morning, not a day. The sensible thing is to do it on the first day of your stay, when no fatigue has accumulated, and leave the afternoon with nothing demanding.
The ideal month is October or November. In October the rain has just withdrawn, from 193.7 to 58.8 millimetres, the canyon vegetation is at its best and highs stay at 26.7 degrees. November is just as good and with less mud.
And it pays to chain it with the rest of the system, which is what gives it meaning. Lake Chapala is some fifty kilometres to the south and is where this water comes from. Seeing first the sheet with 4.5 metres of depth and then the 520-metre cut closes the argument.
What makes this walk different is neither the difficulty nor the scenery, which is good without being exceptional. It is the position: it is rare for a city this size to have, at the level of its last bus stop, half a kilometre of vertical and a river at the bottom.
