Phare du Hourdel, Concrete lighthouse in Le Hourdel, France.

Phare du Hourdel is an 18-metre reinforced-concrete tower on the southern side of Somme Bay, at the tip of the Hourdel point in Cayeux-sur-Mer. Its cylindrical shaft has smooth panels, round porthole windows and a wider gallery carrying a green glazed lantern with a domed roof; a low service room with a white door adjoins the base. The white and green light shows three occultations every twelve seconds.

The original light signal was established in 1840 to help ships navigate the bay safely. After wartime destruction and rebuilding, the current concrete structure became the lasting beacon for the region.

The lighthouse serves visitors as a focal point for watching seabirds that circle above the bay and shoreline. The location draws those interested in observing tidal movements and the rhythm of coastal life.

The site is accessible on foot from the parking area and provides clear views across the bay and shoreline. It's best to visit during stable weather, as coastal winds can sometimes make observation and walking more challenging.

The parking area beside the lighthouse, not the tower itself, is used as a landing zone for Sécurité civile and navy helicopters patrolling the coast in summer. The light shows three occultations every twelve seconds, white or green depending on direction, with a range of 12 nautical miles for white and 9 for green.