The rupiah was a separate currency of Riau between 1963 and 1964. It replaced the Malay dollar at par and was replaced by the Indonesian rupiah at a rate of 1 Riau rupiah = 14.7 Indonesian rupiah. Map of Indonesia showing Riau province Detailed map of Riau Riau is a province of Indonesia, located in the center of Sumatra island along the Strait of Malacca. ... The Malaysian ringgit (unofficially known as the Malaysian dollar), is the official monetary unit of Malaysia. ... Sample of Rupiah banknote The rupiah is the monetary unit of Indonesia (currency code IDR). ...