Subak

Bali's water irrigation system, a marvel of engineering nominated for UNESCO world heritage status, is inter-connected with Bali's social, government and religion systems.

"It is tangible reflection of the original Balinese ideas and beliefs which roots essentially in Tri Hita Karana concept, that is the awareness of the need to always maintain the harmonious relationship between God, Human, and Nature in daily life."

http://whc.unesco.org/en/tentativelists/5100/

http://www.frogsongvilla.com/2012/05/balis-rice-irrigation-system-entered.html

http://www.baliadvertiser.biz/articles/bali_explorer/2011/jatiluwih.html