Debra Sina Monastery is in the highlands of Eritrea near Keren in the Anseba Region, and one of the monasteries in Eritrea. It is one of the oldest monasteries in Africa and the world,and it was built in the 3rd century. It is the site of the first Holy Communion prepared in the Eritrean Orthodox Church, by the 4th-century bishop Aba Salama. The pilgrimage centers on a church above the village where a vision of virgin Mary was said to have been seen by shepherd girls beneath a large boulder. The church is built adjacent to and over the rock where the vision was seen.