Caño Cristales

For years Caño Cristales was effectively off-limits — the Serranía de la Macarena, where it runs, was deep in conflict territory, and you simply did not go. That it is now reachable at all still feels slightly miraculous to the Colombians who guide there, and you feel that history in the careful way the region presents itself. You fly into the small town of La Macarena on a tiny plane, register with the authorities, and are assigned a local guide, because the whole thing is managed to protect a river that is genuinely one of a kind.

The River of Five Colours

The colour comes from a plant called Macarenia clavigera, an aquatic species that carpets the riverbed and, when the light and water levels are exactly right for a few months each year, blushes an intense red — not a tint, a deep arterial red, running in ribbons over the rock with the clear water flowing over it. Around it the river holds yellow sand, green algae, black rock, and pools of impossible blue. The first time we rounded a bend and saw a full stretch of it glowing red under the water, I actually laughed out loud, because it looks fake, like someone has been at the riverbed with paint.

The day is a sequence of natural pools, rapids, and waterfalls with names like Los Ochos and the Piscina de Carlos Pizarro, and at the sanctioned spots you can swim. Floating in a clear pool with red weed waving below you and the equatorial sun overhead is one of the more purely strange pleasures I have had. The rules are strict — no sunscreen or repellent in the water, because it harms the plant, stay on the marked rock — and I was glad of every one of them.

Getting In and the Weight of It

You reach La Macarena only by air, on short flights from Villavicencio or Bogotá, and you go on an organised package because independent visits aren’t permitted. The walking is more than people expect — a few hours over hot, uneven rock each day, in real heat — so it is not a passive trip. Our guide had grown up in the region through its hardest years, and the things he chose to tell us, and the things he didn’t, gave the bright water a depth I hadn’t anticipated. Lia said afterwards that she’d come for the colour and left thinking mostly about the people.

When the Colour Comes

The red only appears in a window, roughly June to November, when the water is low enough and warm enough for the plant to flower — go outside that and you get a pretty but ordinary river. Even within the season the intensity varies week to week, so manage your expectations and trust your guide on timing. Book the package well ahead; flights and permits are limited, and this is not somewhere you can improvise.

When to go: July through October is the safest window for full colour. Bring sturdy shoes you can get wet, a hat, plenty of water, and absolutely no products on your skin for swimming days.