The previous name of the province was
Kampong Pous Thom ('Port', 'City of the Great Snakes'). According to local legend, at a lakeside dock near the Sen River, a pair of large snakes inhabited a nearby cave. On every Buddhist holiday, the snakes would make appearances to the people nearby who then began to refer to the area as
Kampong Pous Thom. Eventually the snakes disappeared and the name was shortened to
Kampong Thom. During the
Colonial Cambodia period, the French divided Cambodian territory into provinces and named most of them according to the local popular names for the respective areas. Kampong Thom was a powerful capital in Southeast Asia during the
Funan period. Prasat Sambor Prei Kuk, dating from the
Chenla era, is in Kampong Thom province. == Geography ==