Kompong Som , formerly Sihanoukville , city and seaport (1994 est. pop. 75000), located in but politically independent of Kampot prov., S Cambodia  The city and port were built on mud flats, with French aid, and grew with the construction of a highway and railroad to Phnom Penh. Kompong Som has an ...   The city and port were built on mud flats, with French aid, and grew with the construction of a highway and railroad to Phnom Penh. Kompong Som has an ...