Abstract      

The Mrigadayavan Palace in Cha-am district, Phetchaburi, Thailand, has faced ecological issues due to seawater intrusion from jetties. Our project goal was to assess the current ecological condition of the palace grounds and communicate the need for a freshwater ecosystem through quantitative evidence on soil and water salinity. We collected supporting evidence through field sampling, archival research, interviews, and observations, determining that the native ecosystem required a low-salinity, sandy environment. To address the saline soil and water, our primary recommendation was regular freshwater recharge to restore the historical salinity of the ecosystem.