El Charco de San Ginés is a shallow tidal lagoon in the middle of Arrecife, ringed by low white fishermen's houses and filled with small painted boats that sit on the mud at low tide and float at high. It is the oldest part of Lanzarote's capital, the reason the town is where it is, and the one corner of Arrecife that consistently surprises people who had written the city off as a ferry port with an airport attached.

The word charco means puddle or pool, and that is literally what it is — a natural inlet connected to the sea by a narrow channel, so the water level rises and falls with the tide. Walk the ring at high water and it is a mirror; come back six hours later and the boats are leaning on wet sand. Both versions are worth seeing and they are not the same place.

It takes about twenty minutes to walk the circuit, or two hours if you stop for a drink, which you should. The lagoon is lined with bars and restaurants, most with tables out on the promenade, and it has become the place people in Arrecife go in the evening.

Why the town grew around a puddle

Arrecife takes its name from the Spanish for reef, and the reefs offshore are the whole point. They break the Atlantic swell, and behind them the coast offers sheltered water — a rare commodity on an exposed island. The charco is the innermost part of that shelter: a pool where a boat could be left safely in any weather, dried out for repairs on the mud, and reached on foot.

For centuries that made it a working fishing harbour. Houses went up around the edge, the lanes behind filled in, and Arrecife grew outwards from this pool. It only became the island capital in 1852, taking the role from inland Teguise, which had been sited away from the coast precisely because the coast was dangerous — the islands spent centuries being raided, a history set out in pirates and corsairs. Once the pirate threat faded, a capital by the harbour made far more sense than a capital hidden in the hills, and the charco was the harbour.

The clean-up that made it worth visiting

This is the part that visitors are never told and that entirely explains the place. Within living memory the charco was not charming. As Arrecife grew through the twentieth century, the lagoon collected the city's runoff and rubbish, the flushing through the narrow channel was not enough to clear it, and by the 1970s and 1980s it was an odorous, silted embarrassment that residents avoided.

What turned it round was a sustained municipal project: dredging the accumulated sediment, improving the exchange of water through the channel so the tide actually flushes the pool, cutting out the drainage that was feeding into it, and then rebuilding the whole perimeter as a paved promenade with the houses restored to white walls and coloured woodwork. The work ran in phases across the 1980s and 1990s and into this century.

The result is a piece of urban rescue rather than preservation. The white-and-blue houses you photograph are genuinely old buildings, but the reason you can stand next to them enjoying the smell of the sea is a drainage scheme. It is the sort of thing that gets left out of the postcard, and knowing it makes the walk better.

The tide is a real variable here, not a detail. At low water the boats sit on exposed mud and the pool shrinks to channels; at high water it is full and reflective. Neither is wrong, but if you want the mirror photograph, check a tide table for Arrecife before you choose your evening.

Walking the ring

The circuit is flat, paved and a little over a kilometre. Start anywhere. The seaward side is the busier, with most of the bars and the widest promenade; the far side is quieter, with smaller houses, boat tackle piled against walls and a better view back across the water to the town.

The details are what hold attention: the boats themselves, painted in the flat blues, greens and reds that Canarian fishing craft have always used; the low houses with their green or blue window frames, a colour convention you will see all over the island and which Canarian architecture explains; the little footbridge; the church of San Ginés just behind, which gives the lagoon its name and is the oldest church in the city.

Behind the lagoon runs Calle León y Castillo, Arrecife's main shopping street, and the lanes between it and the charco are the old town. They are ordinary rather than picturesque, which is part of why the whole thing feels unstaged.

Eating and drinking round the edge

The tapas ring is the main reason locals come, and it works as a circuit rather than a destination. A dozen or more bars and restaurants line the promenade, and the accepted method is to have one thing and one drink at a table, then move on round the water to the next.

What you find is a mix: some straightforwardly traditional places doing fried fish, limpets, croquettes and wrinkled potatoes with mojo; some newer ones doing modern tapas and decent wine lists; a couple of ice cream places for the walk between. Prices are city prices rather than resort prices, which is to say noticeably lower than Puerto del Carmen for the same plate. If the ordering conventions are unfamiliar, how tapas actually works is worth two minutes, and what to eat on Lanzarote covers the island specialities you will see on the boards.

The local wine is the thing to drink with it. Lanzarote's white malvasía, grown in the ash craters of La Geria half an hour inland, is saline and brisk and made for exactly this kind of fish.

Dusk is the hour

If you only go once, go in the last hour before sunset and stay an hour after. The white houses take the low light, the water goes copper and then dark, the boat lamps come on, and the promenade fills with people walking off their dinner. Arrecife is a working city, so the crowd is residents rather than tourists, and the atmosphere is closer to a Spanish provincial evening than anything in the resorts.

Weekends are busiest, and Friday and Saturday evenings around the charco are genuinely lively into the night. Midweek in low season it can be very quiet, which some people prefer. Either way, the thing to avoid is midday: the pool sits in a bowl of white walls, the glare is punishing, and half the bars are shut.

What else is within ten minutes

The charco is the centre of a very compact set of things worth seeing, and Arrecife rewards half a day on foot.

Out on a causeway is the Castillo de San Gabriel, a sixteenth-century fort on an islet reached by an old stone drawbridge, now a small museum of the city's history. Along the seafront in the other direction is the Castillo de San José, a second fort converted by César Manrique into a contemporary art museum with a restaurant built into the rock below — one of his best interventions, and covered further in Manrique's Lanzarote. Between them is Playa del Reducto, the city beach, which is a proper sheltered swimming beach and surprisingly good.

The lagoon is also about ten minutes' walk from the cruise berth area, which makes it the obvious destination for anyone with a few hours ashore — the options are laid out in the Arrecife cruise port guide.

Getting there and parking

Arrecife is the hub of the island bus network, and services run to the capital from every resort — Puerto del Carmen and Costa Teguise are short, frequent hops, and Playa Blanca is longer. Timetables and the payment system are covered in buses in Lanzarote. From the airport the capital is around ten minutes by road, which makes the charco a genuinely good way to spend a last afternoon before a late flight.

Driving in, park in one of the city car parks or the metered blue-line bays near the seafront rather than trying to get close to the lagoon itself; the lanes around it are narrow and largely residential. The blue, white and yellow line system applies as it does everywhere in Spain, and Arrecife enforces it.

If you are collecting a hire car at the airport and heading straight to a resort, consider the reverse: drop the bags, then come back to Arrecife for an evening rather than eating at the hotel on your first night. The charco is twenty minutes from most of the island and it is a better introduction to Lanzarote than any buffet.

A word about the rest of Arrecife

Be honest with yourself about the city. Arrecife is not a pretty town overall — it has apartment blocks, traffic and a workaday centre, and visitors who arrive expecting a Canarian version of a whitewashed Andalucian village will be disappointed within five minutes of leaving the seafront.

What it has is the charco, the two forts, a good beach, a real shopping street and prices that are not aimed at tourists. Taken as a half-day rather than a base, it is one of the more rewarding stops on Lanzarote — and it is the only place on the island where you see ordinary Canarian city life rather than the very controlled, very beautiful version Manrique designed for everyone else.

So, is it worth the trip?

Yes, and specifically in the evening. The Charco de San Ginés is small, free, easy to reach from anywhere on the island and about as photogenic as a town gets in the twenty minutes after sunset. Add a tapas circuit around the water and you have a complete evening out that costs considerably less than dinner in a resort.

Fit it in alongside the island's bigger set pieces — the volcanoes, the caves, the wine country listed in what to do on Lanzarote — as the night-time half of a day that was spent inland. A puddle, dredged and rescued, that turned into the nicest corner of the capital.