Sa-Kao Province. Thailand.

Sa-Kao Province 
          Sa-Kao province is ancient city and its age is more than 4,000 years. Antiques was discovered at Khao Cha-Gun, Aranyaprathech and Tapraya district. The city had prospered in Thavarawadi era since there were Khmer castle and stone inscription. City name was named as name of pool. In year 1781, Chaopraya Mahakasadsuk (King Rama I in later) was moving to Cambodia but stopping near both pools for living and named both pools as "Sa-Kao" and "Sa-Kwan" Sa-kao had been check-point at frontier. In year 1909, Sa-Kao was raised to Sa-Kao sub-district. In 1958, Sa-Kao was raised again to be Sa-Kao district. Until year 1993, Sa-Kao was appointed to be Sa-Kao province where is Thailand 's 74th province.