Ko Si Chang (เกาะสีชัง) is a small island, population 4,500, near Si Racha.
In the Gulf of Thailand, Ko Sichang's proximity to the shipping lanes has made it a convenient anchorage for dozens of barges which transship their cargoes to lighters for the trip up the Chao Phraya to Bangkok. Ko Si Chang makes a nice weekend outing for local tourists.