The Mosque of the Forty Martyrs is a spacious room located to the north of Masjid Umar, where one of it’s two entrances can be found, the other being in Masjid al-Qibly. Historically, it has been used for gatherings for zikr (remembrance of Allah).
View from inside the Mosque of the Forty Martyrs
Zikr session in Masjid al-Aqsa
References: A guide to al-Aqsa mosque – PASSIA
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Some places cannot be verified for certain, and sometimes more than one location claims the same place. We show the most commonly believed site. And Allah knows best.