There is a traveller who arrives in Cancún or Tulum and discovers, on the second day, that what interests them is not the sunbed. They enjoy swimming, but prefer water that does not taste of salt, that lets you see the bottom and that does not depend on whether the Caribbean wakes up covered in sargassum that month. They like to wander among ruins for a while, but without an excursion timetable. And they are drawn more to a lagoon at dawn than to a beach club at noon. This article is for that person.
01 A state with no rivers and a world underfoot
The reason for all of this is the rock. The Yucatán peninsula is a platform of porous limestone: rain does not run across the surface, it seeps in, and fresh water travels through underground galleries until it reaches the sea. Where the roof of one of those galleries has collapsed, a cenote appears, which is really a window onto a hidden river. From the air the state looks flat and green; underneath, it is a Swiss cheese.
The measure of that cheese is the Sac Actun system, near Tulum. After it connected with neighbouring Dos Ojos, divers from the Gran Acuífero Maya project declared the two joined in 2018, and Guinness World Records recorded a submerged length of almost 372 kilometres in 2019. The figures vary depending on whether dry passages are counted and on the source, but the order of magnitude is the same: hundreds of kilometres of cave filled with clear water, in a narrow strip of jungle.
02 Four kinds of fresh water, north to south
The first is the cenote. Around Tulum there are dozens open to the public, from the open-air cavity with light and vegetation to the cave you enter with a life jacket and a borrowed torch. You swim in them, you snorkel and, if you hold the certification, you can cave-dive with a guide. The fresh water is usually clear and cool, more comfortable than the sea in the hot hours.
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The second is the lakes of Cobá, about 47 kilometres northwest of Tulum. The archaeological site spreads between two lakes, Cobá and Macanxoc, and you move through it under trees, along wide jungle paths, on foot or by rented bicycle. It suits a quiet archaeological morning without leaving the water entirely behind.
The third is Sian Ka'an. The biosphere reserve, established in 1986 and inscribed as a UNESCO World Heritage Site in 1987, covers some 5,280 square kilometres of jungle, wetland and coast. Muyil, one of about twenty-three known archaeological sites inside it, lies beside the highway, and from there a path leads to the lagoons and to a canal of Maya origin down which you float with a life jacket. It is a low-effort, very calm experience, and the earlier you go in, the better.
03 Bacalar, where the trip finds its centre
The fourth is Bacalar lagoon, in the south of the state, and it is the one that gives the whole trip its sense. Sources disagree on its length (from a little over forty to about sixty kilometres depending on who measures it), but not on the essentials: it is a narrow, very long body of fresh water with a white bottom that changes shade of blue with depth and hour. The town of Bacalar, on its western shore, is small, and beside it a colonial-era stone fort looks out over the water.
Near the shore there is also a cenote, Cenote Azul, very deep and a dark blue that contrasts with the pale green of the lagoon. And the lagoon is home to stromatolites: mineral structures built by microorganisms, among the oldest forms of life on the planet, which here can be seen a few metres from the shore. They are fragile. You are asked not to touch them, not to step on them and to enter the water without sunscreen or insect repellent, and it is worth doing so: a lagoon this clear is not spoiled by noise, it is spoiled by small details that repeat.
04 How it works in practice
Geography rules: a single road, Highway 307, runs the length of the state and everything above hangs from it. The logic is to sleep in two or three bases and move the suitcase as little as possible: Tulum (or a small village nearby) for the cenotes, Cobá and Muyil; and Bacalar for the lagoon, with a drive of about three hours between the two. Cobá and Muyil work as half-day excursions from Tulum.
It can be done without a car, but with caveats. Between towns there are long-distance buses along Highway 307, so the long transfer is not a problem. What costs you without a car is the last stretch: cenotes and canals lie a little way off the road, and that is where taxis, bicycles or organised excursions come in. A rental car gives you the freedom to arrive at opening time, which is the best moment for almost everything.
In Quintana Roo, the best of the water is not on the coast. It is underneath and behind it.
05 What you have to accept
Three things. The first is that fresh water is a fragile resource and cenotes are not swimming pools. Because rain seeps straight into the aquifer, whatever is spilled at the surface ends up below. That is why almost all ask you to shower before entering and not to wear sunscreen or insect repellent, and in several a life jacket is compulsory even if you can swim. Each site has its own rules: ask before going in. Local press also warns of pollution in urban cenotes in the north of the state and of pressure on Bacalar lagoon, which in 2015 received a pollution alert from the federal environmental authority over illegal dumping and inadequate wastewater treatment.
The second is the crowds. The best-known cenotes next to Tulum fill up by mid-morning, and not every visitor arrives with the same idea of quiet. The fix is to start early, choose lesser-named cenotes and accept that there will be hours when going in is not worth it. This calls for flexible timing and is incompatible with the fixed-agenda excursion.
And the third is the beach expectation. Quintana Roo has one of the best-known coastlines in the Caribbean, but this trip does not revolve around it, and anyone wanting fine sand, gentle surf and beach-bar service will find other formats better resolved. Here the sea is a one-day extra, not the reason; and in sargassum season it is wise to have a fresh-water backup plan, which, given what there is, is not hard to find.
David Burn Oregon for the traveller who goes for what grows and what is caught: from the Willamette Valley to the coastal harbours
Patrice78500 The Peloponnese, for the walker who crosses the Mani tower to tower.
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Dietmar Rabich