The most powerful kingdom in southeast Asia?

There are 10 countries in South East Asia such as Malaysia, Singapore, Thailand, Cambodia, Lao, Myanmar, Indonesia, Brunei, Vietnam, and Philippine.

There was only one that was most powerful than others and one of the seven wonders in the world. That ancient kingdom was "Kingdom of Khmer Empire" OR "Great Khmer Empire". And, the city is Angkor Wat situated in Cambodia. Check more information in internet to confirm that it was true.