Ponta da Ferraria sits on the west coast of São Miguel in the Azores, out in the middle of the Atlantic. Set in a basalt cove and reachable only at low tide, the sea here is warm enough to swim in because a hot spring runs straight into it.
In my humble opinion, this is the most miraculous place on the island.

Go at low tide, or do not go
This is the one thing that decides whether the trip works.
Geothermal vents on the sea floor heat the water from below. At low tide the warm water gathers in the cove and you can swim in it. At high tide the ocean pushes in, cools the whole thing down, and the waves make it unsafe.
Tip
Aim for within about two hours of low tide, roughly an hour before to two hours after. Outside that window you will have driven a long way to look at cold water.
Check the tide before you set off. Spot Azores publishes tide times and has live webcams, so you can see the conditions rather than guess at them.
Getting there
Follow the signs down to Ponta da Ferraria on a very steep paved road. Take the route through the village of Ferraria rather than any shortcut your map suggests.
Right near the parking area stands the Spa Termas da Ferraria, with man-made pools, inside and out, fed by thermal water. That is a separate paid thing and worth knowing about, because plenty of people arrive expecting the natural pool and find the spa first.
The natural pool is further on, past the spa. When I went the signage was not great and I ended up traversing hazardous lava rocks before discovering the nicely paved pathway. Look for the path.
What it is actually like
Once you arrive it is hard not to gape back at the gradient you descend to reach it, an exquisite layering of rocky hues against a black lava coastline, with aggressive 15 to 20 foot waves adding to the drama.

The pool itself is small and cannot fit many people. You climb down a metal ladder into it. There is a rope strung across the water that you hold onto, both to stay in place and to keep from being thrown against the rocks, because the waves are strong.
The experience of swimming here was exhilarating. The waves tugged us back and forth, keeping us completely present in the moment. You feel the warm thermal water oscillating beneath you.
After about fifteen minutes I carefully made my way out and joined the group swimming alongside me on the tiny lava shore, where you feel more of the thermal spring water directly. In summer that little beach is said to be too hot to sit on. In winter it was welcome.
A word about safety
The shore is not as safe as I thought.
A large wave almost pushed me into a boulder. If the swimming friends I had just made had not caught me as it came in, I would have been in for a different kind of vacation. As it was I swallowed some salt water and got away with it, and laughter and shared stories followed. We said goodbye as the sun set over the ocean and the lava rocks.
So: hold the rope, keep an eye seaward, and do not turn your back on the water. Lifeguards are on duty at busy times, but not always.
What to bring
- Water shoes. Not optional. The lava rock is jagged and unforgiving. Neoprene toe shoes or water socks work. Flip flops are worse than useless here and in my opinion present more of a hazard than a help.
- A towel and a change of clothes. There is nowhere comfortable to change.
- A car. Roads on São Miguel are very well paved thanks to EU funding, signage is clear, and cameras give real time weather updates. An automatic makes it easier.
Worth knowing
Ponta da Ferraria is the kind of place you end up telling people about for years.
One last practical thing, whether you are travelling alone or with others: getting a good photo here is hard. Ask someone. Do not be shy, pick someone who looks like they know what they are doing, and you will be glad of it later.