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URUMQI Baratas Hombre Nike Air Force 1 Flyknit Bajas Grises , Jan. 12 (Xinhua) -- Cultural relics workers in northwest China's Xinjiang Uygur Autonomous Region have spent the past five years renovating an ancient subterranean irrigation system, according to a summary released by a local cultural relics bureau on Monday.


The karez irrigation system was built 2,000 years ago. The karez wells, which convey water from deep underground to the surface, are considered one of China's greatest surviving ancient man-made structures Hombre Nike Air Force 1 Bajas Verdes Baratas , along with the Great Wall and the Grand Canal.


Renovation started at the end of 2009 and, to date, four stages of renovations, covering 108 karez well systems with a total underground canal length of 18 km, have been carried out in the prefecture of Turpan Mujer Nike Air Force 1 Bajas GS Rosa Baratas , said Zhao Qiang, Party head with the cultural relics bureau of Turpan Prefecture.


More than 600 km of the underground canals were desilted and more than 10,000 vertical shafts have been repaired, Zhao said.


Total spending on the restoration has reached 45 million yuan (7.26 million U.S. dollars).


Preparation for the fifth stage, which involves renovation of 15 karez wells Hombre Nike Air Force 1 Bajas Grises Baratas , is under way and will start this year.


Traversing more than 5,000 kilometers, the karez wells are known as the "Great Underground Wall."


The karez well systems are composed of vertical shafts, subterranean and ground canals, and small reservoirs. The canals are supplied with water from the melted ice and snow in Xinjiang's Tianshan Mountains.


Turpan Hombre Nike Air Force 1 Deconstruct PRM Grises Baratas , the hottest and driest region in China, has been using the system to avoid water evaporation at the ground surface. Currently, there are more than 1,000 karez wells in Turpan prefecture, most of which have dried up because of groundwater recession and damage to the wells.


Karez wells are also found in nearby countries Nike Air Force 1 Hombre Bajas Rojas Baratas , including Afghanistan, Iran and Pakistan. In China, they can also be found in the provinces of Gansu, Shaanxi and Shanxi.


MOSCOW, April 10 (Xinhua) -- Russian paratroopers Mujer Nike Air Force 1 Bajas Rojas Baratas , along with units of the Russia-led Collective Security Treaty Organization (CSTO), are carrying out a rescue drill in the Arctic region simply using skis and dog-driven sleds, the Defense Ministry said Friday.


"The paratroopers practicing a humanitarian search-and-rescue mission are riding dog sleighs heading to the North Pole," the Interfax news agency quoted the ministry as saying.


According to the ministry, the troops cover up to 80 km during a 10-hour march each day.


This is the first time ever for troops of Russia and the CSTO to conduct a humanitarian rescue drill in the near-polar region without employing any mechanical vehicles.


Russian airborne troops along with the units of the rapid response force of the CSTO landed on the Arctic Ocean