The Cambodian riel (KHR) is the currency of Cambodia. It is subdivided into 100 sen. The National Bank of Cambodia issues the currency. While the riel is the official currency, the US dollar is also widely used in Cambodia, particularly in tourist areas and for larger transactions. The Cambodian economy is developing, and the riel's value has fluctuated over time. The dual currency system reflects the influence of the US dollar in the Cambodian economy.