rajjaprabha dam (chiew larn) khao sok national park, suratthani of thailand

architecture beautiful chiew chiewlarn concrete construction dam electric electricity energy engineering environment famous flowing hydro hydroelectric industry khao landscape larn mountain national nature outdoor park place plant power rajjaprabha rajjaprapha reservior river road rock scene scenery sok spillway station stone structure supply suratthani technology thailand travel view wall water x28 x29