A tunnel is used to carry irrigation and drinking water from an underground source by gravity flow.


Location: Southwest Asia Official name: State of Qatar Formation (date of independence / date current borders were established): 1971 / 1971 Capital city: Doha Population: 1.5 million / 353 people per sq mile (136 people per sq km) Total land area: 4416 square miles (11,437 square km) Language(s) spoken: Arabic (official language) Main religions: Muslim … Read more

Qin Ling Mountains

Mountains in southeastern and east-central China. They divide the northern part of China from the southern part.