question #3 Sahih Muslim 1182c, Book 15, Hadith 17 : What is the significance of entering the state of Ihram at specific locations for pilgrims according to Islamic tradition?

I heard the Messenger of Allah (ﷺ) as saying that the people of Medina should enter upon the state of Ihram at Dhu’l- Hulaifa, the people of Syria at Mahya’a and that is Juhfa, and the people of Najd at Qarn (al-Manazil). ‘Abdullah b. ‘Umar (Allah be pleased with them) said: (I did not hear it myself from him) but heard from them saying that the Messenger of Allah (ﷺ) had (also) said: The people of Yemen should enter upon the state of Ihram at Yalamlam.