The Khmer Empire was in Southeast Asia.
Cambodia ( [ kæmˈboʊdiə ] កម ព ជ , or Kampuchea [ kɑmpuˈciə ] ) , officially known as the Kingdom of Cambodia ( ព រ រ ជ ណ ចក រកម ព ជ , Preăh Réachéanachâk Kâmpŭchéa , [ ˈprĕəh riəciənaːˈcɑk kɑmpuˈciə ] ) , is a country located in the southern portion of the Indochina Peninsula in Southeast Asia . Khmer Empire . Its greatest legacy is Angkor , in present-day Cambodia , which was the site of the capital city during the empire 's zenith .