Allah's Messenger (ﷺ) made Dhul-Huiaifa as the Miqat for the people of Medina; Al-Juhfa for the people of Sham; Qarn-al-Manazil for the people of Najd; and Yalamlam for the people of Yemen; and these Mawaqit are for the people at those very places, and besides them for those who come thorough those places with the intention of performing Hajj and `Umra; and whoever is living within these boundaries can assume lhram from the place he starts, and the people of Mecca can assume Ihram from Mecca.
Reference: Sahih al-Bukhari 1524 In-book : Book 25, Hadith 12 USC-MSA web (English) : Vol. 2, Book 26, Hadith 599 (deprecated)
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