THE Cambodian riel, denoted by KHR, is the official currency of Cambodia. Divided into 100 sen, the Cambodian riel is mainly used for buying local produce and other merchandise. Cambodian riels above 20,000 are very rare due to the low prices in Cambodia. The United States Dollar (USD) is known as Cambodia’s unofficial second currency. The USD is used widely throughout Cambodia for all purposes and sometimes preferred over the riel. The exchange rate for the Cambodian riel is about 4,000 riels to 1 US Dollar.