While it is well-recognised that the "worst forms of child labour" are pervasive throughout Cambodia, the full dimension of urban child labour remains elusive, in part because of the wide range of implicated sectors (both formal and informal), the broad geographic reach and disparities depending on location, the hidden nature of particular forms of labour (domestic labour, illegal drug trafficking, underground commercial sexual exploitation, etc.), the fluidity of child labour trends and patterns, and the scarcity of up-to-date comprehensive data on child labour in Cambodia.