Subak is the water management (irrigation) system for the paddy fields on Bali island, Indonesia. It was developed in the 9th century. For the Balinese, irrigation is not simply providing water for the plant's roots, but water is used to construct a complex, pulsed artificial ecosystem. The system consists of five terraced rice fields and water temples covering nearly 20,000 hectares (49,000 acres). The temples are the main focus of this cooperative water management, known as subak. 

Subak is a traditional ecologically sustainable irrigation system that binds Balinese agrarian society together within the village's Bale Banjar community center and Balinese temples. The water management is under the authority of the priests in water temples, who practice Tri Hita Karana Philosophy, a self-described relationship between The Humans, The Earth and The Creator.

 Tri Hita Karana draws together the realm of spirit, the human world and nature. The overall subak system exemplifies this philosophical principle. Water temple rituals promote a harmonious relationship between people and their environment through the active engagement of people with ritual concepts that emphasize dependence on the life-sustaining forces of the natural world. Rice is seen as gift from The Creator of Universe, and the subak system is part of temple culture.