Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) said: "The best water on the face of the earth is Zamzam; it is food for the hungry and a cure for illness. And the worst water on the surface of the earth is the water of the valley of Barhut, which is the remnant of Hadramaut. It is like a swarm of locusts among insects; in the morning it boils up with force, and by evening there is no moisture left in it."