The Phu Wua Wildlife Sanctuary in the Bung Khla district of Bung Kan province has closed its three waterfalls – Tham Phram, Jed Si, and Tham Foon – from July 21-27 as a precautionary move against possible flash floods due to heavy rains during this period, sanctuary head Thaweep Khamphaengmuang said on Sunday. The three popular waterfalls would reopen on July 28, he added.