question #3 Sahih Muslim 1183b, Book 15, Hadith 20 : What is the significance of specifying different Ihram entry points for various regions in Islamic tradition?

I heard (and I think he carried it directly to the Messenger of Allah) him saying: For the people of Medina Dhu’l-Hulaifa is the place for entering upon the state of Ihram, and for (the people coming through the other way, i.e. Syria) it is Juhfa; for the people of Iraq it is Dhat al-‘Irq; for the people of Najd it is Qarn (al-Manazil) and for the people of Yemen it is Yalamlam.