Mishkat al-Masabih 2516
Ibn ‘Abbas said that God’s messenger appointed the following places for putting on the ihram:
Dhul Hulaifa for the people of Medina, al- Juhfa for the people of Syria, Qarn al-Manazil for the people of Najd, and Yalamlam for the people of the Yemen ; so these spots are for these regions and for people of other regions who come to them intending to perform the hajj and the ‘umra . The place where those who live nearer to Mecca should put on the ihram (The pilgrim dress) is where they live, and so on and so on up to the inhabitants of Mecca itself who put on the ihram in it. 

Bukhari and Muslim.
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: وَقَّتَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لِأَهْلِ الْمَدِينَةِ: ذَا الْحُلَيْفَةِ وَلِأَهْلِ الشَّامِ: الْجُحْفَةَ وَلِأَهْلِ نَجْدٍ: قَرْنَ الْمَنَازِلِ وَلِأَهْلِ الْيَمَنِ: يَلَمْلَمَ فَهُنَّ لَهُنَّ وَلِمَنْ أَتَى عَلَيْهِنَّ مِنْ غَيْرِ أَهْلِهِنَّ لِمَنْ كَانَ يُرِيدُ الْحَجَّ وَالْعُمْرَةَ فَمَنْ كَانَ دُونَهُنَّ فَمُهَلُّهُ مِنْ أَهْلِهِ وَكَذَاكَ وَكَذَاكَ حَتَّى أهل مَكَّة يهلون مِنْهَا