Mehirs of Lavajo, Archaeological site in Alcoutim, Portugal.

The Menhirs of Lavajo are three carved menhirs of dark grey greywacke on a 155-metre hilltop between the Lavajo valley and ravine. The largest, Lavajo I, stands 3.14 metres high, has a phallic form and an ellipsoidal section, and is decorated with a longitudinal groove, cup marks and circles. Two menhirs remain in their original sockets; the third, heavily fragmented, is kept in the Alcoutim museum.

Excavations in the 1990s uncovered fragments of multiple stones from the Late Neolithic period, dating between 3500 and 2800 BCE. These findings suggest the place served as an important location for social or religious gatherings during this prehistoric era.

The three menhirs are cut from dark grey greywacke. Their surfaces carry vertical grooves, small cup marks, anthropomorphic elements and circular or horseshoe-shaped carvings; one stone shows a perforated circle. The largest, Lavajo I, is 3.14 m high and roughly phallic in form. A second group, Lavajo II, lies about 250 m away across the Barranco do Lavajo.

The archaeological site is fenced and includes a dedicated parking area along with a walking path for visiting. Information and guided tours are available through the Alcoutim municipality.

The largest menhir, Lavajo I, is 3.14 m tall and is considered the tallest known in Portugal. It was identified in 1992 by archaeologists António do Nascimento, João Luís Cardoso and Mário Varela Gomes, and the site was officially opened on 25 April 2004.