Paraphrased from Wikipedia:

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What is Zamzam water? According to Islamic and other religious narratives, the Zamzam water is sourced from the Zamzam well; this is a miraculously generated source of water, which opened up thousands of years ago when the son of Ibrahim (Abraham), Ismaʿil (Ishmael), was left with his mother Hajar (Hagar) in the desert.

The Zamzam Well is a well located within the Masjid al-Haram in Mecca, Saudi Arabia. It is located east of the Kaʿba; the holiest place in Islam.
From a scientific perspective Zamzam water is colourless and odorless, but has a distinctive taste, with a pH of 7.9–8, and so is slightly alkaline. It has a relatively high concentration of magnesium, calcium, potassium and sodium.

For those who want to read more, check out this journal article:

https://www.tandfonline.com/doi/full/...

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