The Messenger of Allah (SWAS) appointed the following places for putting on Ihram : Dhul al-Hulaifah for the people of Madina, al-Juhfah for the people of Syria and al-Qarn for the people of Najd and have been told that appointed Yalamlam for the people of Yemen.
Sunan Abi Dawud Book 11, Hadith 17
← Previous Hadith she took her child by his arm and lifted him from her litter at the camel. She said Messenger of Allah (SWAS) can this (child) be credited with having performed Hajj. He replied Yes, and you will have a reward.

Sunan Abi Dawud Book 11, Hadith 16 Next Hadith → The Messenger of Allah (SWAS) appointed places for putting on Ihram and narrated the rest of the tradition to the same effect (as mentioned above).

One of them said and Yalamlam for the people of Yemen. The other narrator said Alamlam. These (places for Ihram) are appointed for these regions and for people of other regions who come to them intending to perform Hajj and `Umrah. The place where those who live nearer to Makkah should put on Ihram from where they start and so on up to the inhabitants of Makkah itself who put on Ihram in it. This is the version of Ibn Tawus.

Sunan Abi Dawud Book 11, Hadith 18