Pong Nam Ron

Pong Nam Ron (Thai: โป่งน้ำร้อน, pronounced [pòːŋ nám rɔ́ːn]) is the easternmost district (Amphoe) of Chanthaburi Province, 

History

The minor district (King Amphoe) Pong Nam Ron was upgraded to a full district on 25 July 1941.

^Source https://en.wikipedia.org/wiki/Pong_Nam_Ron_District