Namtok Kaeng Sopha (Thai: น้ำตกแก่งโสภา) is a waterfall in Wang Thong District, Phitsanulok Province, Thailand.^[1] It is in Thung Salaeng Luang National Park on the Wang Thong River off of Lomsak Road (Highway 12). It is the largest waterfall in Phitsanulok. Kaeng Sopha is a tiered waterfall shaped like a stairway. Kaeng Sopha is the subject of a June 2007 postage stamp in Thailand in the Thailand Waterfall series.^{[citation needed]}