Almost every hiking route promises the same thing: a landscape, a climb and a summit. There is an island where the routes promise something else. In Madeira the paths follow irrigation channels, and those channels, when the mountain gets in the way, do not go around it: they go through it.
The island's levada network totals more than 2,170 kilometres of channel, and within that figure there are some 40 kilometres of tunnel cut into the rock. They are old works, unlit, some long and some low enough to make you walk bent double. And they have a path alongside, because somebody had to go in to maintain them.
01 Forty kilometres of tunnel
It is worth understanding where that figure comes from. The ridge crosses Madeira from east to west and tops out at 1,862 metres at Pico Ruivo. The water is in the north, where up to 2,800 millimetres fall a year, and the people are in the south, where Funchal receives 817.7. Transferring from one side to the other means drilling.
The first large channels were cut in the late fifteenth century and the first half of the sixteenth, with the sugar boom. But until the end of the eighteenth century the south was irrigated only with levadas that did not cross the central range: getting through it was technically risky and very expensive. The tunnels came later, and they are the youngest and most spectacular part of the system.
The result, for anyone walking, is a kind of route that hardly exists anywhere else: kilometres of horizontal path on the mid-slope, interrupted every so often by a black mouth in the rock.
02 The route that explains it all
If you are only going to do one, do the Caldeirão Verde, signposted as PR 9. It starts at the Queimadas forest park, on the northern slope, and follows the levada of the same name for about 8.7 kilometres each way, that is, some 17.4 kilometres in total if you come back the same way.
The climb is minimal, because the channel holds the contour and the path sticks to it. What makes the day take between four and six and a half hours is not the gradient: it is the distance, the wet ground and the four tunnels.
At the end of the route there is a waterfall dropping vertically from about a hundred metres into a pool. It is the turnaround point, and it works as a reward, but the interesting part of the day is the journey.
03 What it feels like in there
The four tunnels of PR 9 vary in length and in height, and at least one is long and very low, so there are stretches where you have to go bent over. None of them is lit. A head torch is not a recommendation: it is mandatory kit, and it is worth wearing something on your head as well.
Inside, the floor is uneven stone and always wet, the rock drips from above and the channel runs on one side with a sound the vault amplifies. You lose the outside reference entirely: no slope, no sky, only the circle of the torch and the noise of the water.
And then you come out. The sequence repeats four times and it is what gives the route its character: forest, darkness, forest, darkness. It feels closer to walking through a piece of engineering than to going on a hike.
The channel does not go around the mountain: it goes through it, and the path follows.
04 And what is outside
The forest these routes pass through is not any forest. It is the laurisilva, a remnant of the laurel vegetation that millions of years ago covered much of southern Europe and northern Africa, and which on this island has existed for at least 1.8 million years.
It covers some 15,000 hectares, 20 % of the island's surface, is considered the largest surviving area of laurel forest in the world, and around 90 % is primary forest. UNESCO declared it a World Heritage Site in 1999. It grows mainly between 400 and 1,200 metres, which is exactly the band the levadas run through.
That is no coincidence: forest and channel share an altitude because they share the same condition, the constant humidity of the northern slope. Walking a levada is walking along the upper edge of the island's water system, and the forest is what feeds it.
05 The water is not scenery: it is the reason
It is worth being clear about what you are walking, because it changes the experience. The levada is not a footpath with a decorative channel added alongside. It is the reverse: the channel is the work, and the path exists because somebody had to walk it to keep it clear and to distribute the water in turns.
That explains two practical things. First, why the route is so flat: the water has to move on its own with a minimal gradient, and so the path does not climb either. Second, why it is sometimes so narrow and exposed: nobody designed it for strolling, but so that one person with a tool would fit.
On quite a few stretches the channel runs along a ledge with no railing, wall on one side and the drop into the ravine on the other. If you have a fear of heights, that is this trip's real filter, more than the distance or the tunnels.
06 How the trip is put together
Five to seven days allow you to walk a different levada each day without repeating, and it pays to base yourself in the north or the centre so you do not cross the island every morning. The Caldeirão Verde day needs a full day; the rest can be staggered according to what your legs will take.
The kit is not negotiable: a head torch with spare batteries, a genuine waterproof, footwear with soles that grip on wet stone, and something on your head for the low tunnels. You are on the side of the island that receives up to 2,800 millimetres a year, and at 1,610 metres the high station measures 2,927.8.
What makes this trip different is not the difficulty, which is moderate, nor the landscape, which is extraordinary but not unique. It is that for a few kilometres you stop walking on the mountain and start walking inside it, following a river somebody decided to build four hundred years ago.
