Razavi Khorasan Province in the context of Khorasani Turkic

The Qanats of Ghasabeh (Persian: قنات قصبه), also called Kariz e Kay Khosrow, is one of the world's oldest and largest networks of qanats (underground aqueducts). Built between 700 and 500 BCE by the Achaemenid Empire in what is now Gonabad, Razavi Khorasan Province, Iran, the complex contains 427 water wells with a total length of 33,113 metres (20.575 mi). The site was first added to UNESCO's list of tentative World Heritage Sites in 2007, then officially inscribed in 2016, collectively with several other qanats, as "The Persian Qanat".

South Khorasan province (Persian: استان خراسان جنوبی) is one of the 31 provinces of Iran, located in the eastern part of the country. Its capital is the city of Birjand. In 2014, the province was placed in Region 5. This province is bordered to the north by Razavi Khorasan Province, to the northwest by Semnan Province, to the west by Isfahan and Yazd Provinces, to the south by Kerman Province, and to the southeast by Sistan and Baluchestan Province. The area of this province is 151,913 square kilometers (58,654 square miles), making it the third largest province in Iran after Kerman and Sistan and Baluchestan. According to the 2016 census, South Khorasan's population is 768,898, making it the fourth least populous province in the country. With only about 5 inhabitants per square kilometre or 13 inhabitants per square mile, it is the most sparsely populated province in Iran.

South Khorasan Province is split into two distinct regions: the "mountainous and elevated" areas in the north and northwest, and the "low and flat" central and southern plains. The tallest mountains in the province include "Kamarak" and "Shah Kuh." It experiences a "dry and desert" climate, which can be further divided into "hot and dry" and "mild and dry" categories. The northern and northwestern parts are more fertile, while the southern and southwestern plains endure a dry and harsh climate. The rivers in this region are seasonal, with no permanent rivers present.

Hamza ibn Ali ibn Ahmed (Arabic: حمزة بن علي بن أحمد, romanized: Ḥamza ibn ‘Alī ibn ʾAḥmad; c. 985–c. 1021) was an 11th-century Persian Ismai'li missionary and founding leader of the Druze. He was born in Zuzan in Greater Khorasan in Samanid-ruled Persia (modern Khaf, Razavi Khorasan Province, Iran), and preached his heterodox strand of Isma'ilism in Cairo during the reign of the Fatimid caliph al-Hakim bi-Amr Allah.

Despite opposition from the established Isma'ili clergy, Hamza persisted, apparently being tolerated or even patronized by al-Hakim himself, and set up a parallel hierarchy of missionaries in Egypt and Syria. Following al-Hakim's disappearance—or, most likely, assassination—in February 1021, Hamza and his followers were persecuted by the new regime. Hamza himself announced his retirement in his final epistle to his followers, in which he also promised that al-Hakim would soon return and usher the end times. Hamza disappeared thereafter, although one contemporary source claims that he fled to Mecca, where he was recognized and executed. His disciple Baha al-Din al-Muqtana resumed Hamza's missionary effort in 1027–1042, finalizing the doctrines of the Druze faith.

Khorasani Turks (Persian: ترک‌های خراسان; Khorasani Turkic: خوراسان تؤرکلری) are a Turkic ethnic group inhabiting part of North Khorasan, Razavi Khorasan and Golestan provinces of Iran, as well as in the neighboring regions of Turkmenistan up to beyond the Amu Darya River and speak Khorasani Turkic. Some can also speak Kurdish due to intermarriages with Khorasani Kurds, and they can also speak Persian as it is the lingua franca of Iran.

The Khorasani Turks are not to be confused with other Turkic groups which have arrived in Khorasan more recently, especially Iranian Azerbaijanis, who had a presence in the area, especially in Mashhad, from about the early 20th century.

Gonabad (Persian: گناباد) is a city in the Central District of Gonabad County, Razavi Khorasan Province, Iran, serving as capital of both the county and the district.

The city is best known as the home of the Gonabadi Dervishes and also for its qanats, (known also as kariz). It is one of the most important producers of saffron in Iran. Other agricultural products include: Grape, Pistachio and pomegranate. The shrine the Ni'matullāhī Gonabadi dervish order is located in Beydokht, a village in the Gonabad county.

The Goharshad Mosque (Persian: مسجد گوهرشاد, romanized: Masjid-i Gawhar Shad; Arabic: مسجد كوهرشاد) is a grand Friday mosque (jāmeh) that is part of the Imam Reza Shrine complex, located in Mashhad, in the province of Razavi Khorasan, Iran. Construction of the mosque commenced in 1418 CE, during the Timurid era, and was completed in c. 1430 CE. Another Gawhar Shad Mosque, built at the same time, is located in Herat.
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