São João da Foz Range Rear Light

São João da Foz Range Rear Light in Porto is the rear marker of the leading-light pair that guides ships into the mouth of the Douro. It is not a stand-alone lighthouse tower: the lamp is fixed to the west tower of the church of São João Baptista da Foz, in the Foz do Douro district.

What does it do?

Leading lights work like a gun sight for mariners. A skipper sees two lights, one above the other, and when they line up the vessel is on the safe approach into the river. The front light sits on a post by the riverfront, while this rear light is mounted far higher on the church tower, which keeps the two easy to tell apart.

What are its characteristics?

The focal plane is about 38 m above sea level. Light lists record it as yellow, although photographs make it look red. It shows 3 seconds on and 2 seconds off. The light is active, but the tower itself is closed to visitors.

Where is it and how do you see it?

The church stands on Largo da Igreja, just behind the Jardim do Passeio Alegre park. The area is open, so you can look at the light from outside during a stroll through Foz. Keep in mind this is a church tower carrying a navigation lamp, not a classic lighthouse with a gallery.

What else is nearby?

• Jardim do Passeio Alegre is a 19th-century park with palm trees and a bandstand, one of the first bathing spots used by Porto's middle class.
• Forte de São João Baptista da Foz is the fortress guarding the river mouth, with construction beginning in 1570.
• Felgueiras Lighthouse at the end of the old breakwater on the north side of the estuary is a different structure from the light described here.
• Rio Douro North Mole light, a red-and-white tower dating from 2010, is another marker at the river entrance.

When should you go?

The light works at night, but the church and surroundings are best explored in daylight, when the park and promenade are pleasant. Combine an evening walk along Foz with the Atlantic sunset, then look toward the tower after dark to catch the rhythmic signal.

Frequently asked questions

Can I climb the tower?

No. The grounds are open, but the tower is closed to visitors.

Is it the same as Felgueiras Lighthouse?

No. Felgueiras stands at the end of the breakwater at the estuary, while this light is on a church tower further inland in the district.

What colour is the light?

Listings give yellow, but it appears red in photos. It shows 3 seconds on, 2 seconds off.

How do I tell the rear light from the front one?

The front light is on a post on the riverfront; the rear one is on the church tower at roughly 38 m.

How long does a visit take?

Ten to fifteen minutes is enough, ideally as part of a longer walk around Foz do Douro and Passeio Alegre.