Where is Angkor Wat situated in modern times?

Identifying the modern country of a historical monument requires matching the monument's location to the present-day nation whose sovereign territory contains that site — distinct from the older kingdom or empire under which it may have been built, and distinct from other countries in the same cultural or religious sphere.

Angkor Wat is a 12th-century temple complex built during the Khmer Empire, in a region historically called Kampuchea. It stands in Siem Reap Province, within the present-day Kingdom of Cambodia, and is administered as a UNESCO World Heritage Site by Cambodia's national heritage authority, APSARA.

• Sri Lanka is an island nation in the Indian Ocean; its major heritage sites, such as Sigiriya and Anuradhapura, belong to a separate Sinhalese-Buddhist tradition unconnected to the Khmer Empire.

• China lies in East Asia and is home to its own distinct monuments, such as the Great Wall and the Forbidden City, built by Chinese dynasties rather than the Khmer Empire.

• Myanmar, in mainland Southeast Asia, has its own major temple complex at Bagan, built under the Pagan Kingdom — a separate civilization from the Khmer Empire that built Angkor Wat.

Since Angkor Wat lies in Siem Reap Province within Cambodia's present-day borders, the country in which it is situated today is Cambodia (Kampuchea).