Analysis of information sources in references of the Wikipedia article "大呼罗珊" in Chinese language version.
In the early centuries of Islam, Khurasan generally included all the Muslim provinces east of the Great Desert. In this larger sense, it included Transoxiana, Sijistan and Quhistan. Its Central Asian boundary was the Chinese desert and the Pamirs, while its Indian boundary lay along the Hindu Kush toward India.
historical region and realm comprising a vast territory now lying in northeastern Iran, southern Turkmenistan, and northern Afghanistan. The historical region extended, along the north, from the Amu Darya (Oxus River) westward to the Caspian Sea and, along the south, from the fringes of the central Iranian deserts eastward to the mountains of central Afghanistan. Arab geographers even spoke of its extending to the boundaries of India.
historical region and realm comprising a vast territory now lying in northeastern Iran, southern Turkmenistan, and northern Afghanistan. The historical region extended, along the north, from the Amu Darya (Oxus River) westward to the Caspian Sea and, along the south, from the fringes of the central Iranian deserts eastward to the mountains of central Afghanistan. Arab geographers even spoke of its extending to the boundaries of India.