Located on the southern edge of Tel al-Duhur in Silwan, Ain Umm al-Darj, also known as Ain Sitna Maryam, has been a crucial water source for Jerusalem since ancient times. The Canaanites, during times of siege, ingeniously dug a tunnel through the rock of this hill to access water from the spring. This tunnel is now known as Warren's Tunnel, named after its English discoverer.
A few meters from the spring is the Pool of Silwan, a significant site in Christian tradition. It is believed that Jesus Christ restored the sight of a blind man after he bathed in this pool.