The name means "Temple City" (wat = temple) is the largest religious monument in the world, on a huge site measuring 1,626,000 m2. Around the site is a moat 5 km long. It still plays an important role in the Buddist faith.
It was built by a Khmer King in the 12th century, and has since the been subjected to several wars and rebuilds, and in later periods to lootings.
Today the site is visited yearly by around 2,6 million tourists. Since Siem Riep is the close city, the tourist trade is a major source of income.