psah chas (, literally "old market"), also commonly spelt as phsar chas, psar chas or psar chaa, is a market in the city of siem reap in northern cambodia. not to be confused with the similarly named "psah chas" in phnom penh that is geared toward locals, this market in the south of the city caters to locals and tourists alike. the market is such a fixture in siem reap that many businesses give their address in relation to "psah chas". the khmer word "psah" (, "market")) is derived from "pasar" ("market"), either from malay or cham, both of which in turn derive from persian "bazar".