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Most internal migrants have settled near the cities of Tehran, Isfahan, Karaj, Ahvaz, Mashhad and Qom. Tehran, with a population of 8.7 million (2016 census), is the largest city in Iran and is the nation's capital. Tehran is home to around 11% of Iran's population. It is the hub of the country's communication and transport networks.
India-Iran-Afghanistan transport corridor map. In 2016, India signed a deal with Iran entailing $8 billion investment in Chabahar port and industries in Chabar Special Economic Zone, including an aluminium smelter and a urea making facility, at Chabahar port is being developed was a transit route to Afghanistan and central Asia. [51]
Qanat. A qanat or kārīz is a system for transporting water from an aquifer or well to the surface through an underground aqueduct; the system originated approximately 3,000 years ago in Iran. [1] The function is essentially the same across the Middle East and North Africa, but the system operates under a variety of regional names: qanat or ...
The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake and sometimes referred to as a full-fledged sea. [2] [3] [4] An endorheic basin, it lies between Europe and Asia: east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau.
Geographically, the country of Iran is located in West Asia and borders the Caspian Sea, Persian Gulf, and Gulf of Oman. Topographically, it is predominantly located on the Persian Plateau. Its mountains have impacted both the political and the economic history of the country for several centuries. The mountains enclose several broad basins, on ...
Show map of Iran Show map of West and Central Asia Show all. The Shushtar Historical Hydraulic System (Persian: سازههای آبی شوشتر) is a complex irrigation system of the island city Shushtar from the Sassanid era. It consists of 13 dams, bridges, canals and structures which work together as a hydraulic system.
Tidal irrigation at Abadan island, Iran. The Abadan Island (Fig. 1) in Khūzestān Province is situated between the Arvand and Bahmanshir rivers. The Arvand river (in Arabic: Shatt al-Arab) forms the boundary between Iran and Iraq and collects the waters from the Euphrates and Tigris rivers. On the island orchards of date palm are found on ...
Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.