irrigation systems

Researchers have long been fascinated by the secrets of the existence of a luxurious garden in the ancient palace of Ramat Rahel, the area on the hilltop of Jerusalem. -lem today.

Unesco's Science, Education and Cultural Organization recognized Thanh Thanh Mountain and Do Giang Yen irrigation project as a World Cultural Heritage in 2000.

The Volta Delta is located in West Africa, home to 24 million people in 6 countries