Bali is a province of Indonesia and the westernmost of the Lesser Sunda Islands. Located east of Java and west of Lombok, the province includes the island of Bali and a few smaller neighbouring islands, notably Nusa Penida, Nusa Lembongan, and Nusa Ceningan. The provincial capital, Denpasar, is the most populous city in the Lesser Sunda Islands and the second largest, after Makassar, in Eastern Indonesia. Bali is the only Hindu-majority province in Indonesia, with 83.5% of the population adhering to Balinese Hinduism. Tourism-related business makes up 80% of its economy. Bali is part of the Coral Triangle, the area with the highest biodiversity of marine species especially fish and turtles. In this area alone, over 500 reef-building coral species can be found. For comparison, this is about seven times as many as in the entire Caribbean. Bali is the home of the Subak irrigation system, a UNESCO World Heritage Site. It is also home to a unified confederation of kingdoms composed of 10 traditional royal Balinese houses, each house ruling a specific geographic area. The confederation is the successor of the Bali Kingdom. The royal houses are not recognised by the government of Indonesia; however, they originated before Dutch colonisation.