Possible Clues:

• Thailand once
• Gulf of --, arm of the South China Sea between the Malay Peninsula and Indochina
• Kingly literary place
• Land visited by Anna
• Former name (until 1939) for Thailand
• Place that gave its name to a cat breed
• Land of Rama I
• Kingdom in 'The King and I'
• Thailand, in the past
• Where Anna was governess