China - Karez Wells

"Historical documents show that the sinking method of the Karez wells inside Xinjiang including the Western Region was introduced by the Han people. The majority of the ethnic minorities of the northwest borderland hadn't mastered the sinking technology by that time. It was Lin Zexu that stood out among all the people who advocated and promoted the Karez wells as the most powerful and influential one in modern times. Ever since then the Karez wells have been part of the irrigation works." Source: UNESCO World Heritage Tentative List

The Karez System. Nice stamps including Special Olympics World Summer Games Shanghai 2007. Thanks to Scaret of China.