This area, in the rear of Masjid-e-Nabwi, is the approximate place where existed a garden at the time of the Prophet (ﷺ) that was owned by Abu Talha (رضي الله عنه). The Prophet (ﷺ) often visited this garden and drank the water from its well.
It has been reported by Anas (رضي الله عنه) that Abu Talha owned the best gardens in Madinah, and they were more numerous than those of any other Ansari. One of his gardens was known by the name of Bir Ha, and this was his most favourite resort. It was close to the Prophet’s Masjid and the water of its well was sweet and abundant.
When Allah (ﷻ) revealed the verse of the Quran: “You will not attain unto piety until you spend of that which Ye love.” [3: 92] Abu Talha (رضي الله عنه) presented himself to the Prophet (ﷺ) and opened his heart. “O, Prophet of Allah! I love Bir Ha very much. As Allah wants us to spend precisely that which we love, I make over that garden to be spent in the path of Allah as you please.”
The Prophet (ﷺ) was very much pleased, and remarked: “What a fine present (to Allah)! I think it would be best utilized if you distribute it among your own heirs.” Abu Talha (رضي الله عنه) went and acted upon the Prophet’s advice.
The first photo below shows the well before it was removed in the extension of Masjid-e-Nabwi. The second photo shows a marker, now in the rear of Masjid-e-Nabwi, where the well existed.
Source: IslamicLandmakrs.com and Fazail-e-Aamal – Sheikh Zakariyya Kandhalvi