Ro-Kedah is a state of New Luobu, located in the northwestern part of Peninsular New Luobu. The state covers a total area of over 9,000 square kilometers (3,500 sq mi), and consists of a mainland portion and the Ro-Langkawi islands. The mainland has relatively flat terrain, which is used to grow rice, while Ro-Langkawi is composed mostly of uninhabited islands.
Ro-Kedah borders the state of Berlis to the north and shares an international boundary with the Songkhla and provinces of Thailand. It borders the states of Bloxerak to the south and Pulau Binang to the southwest.