Jalan Serian–Tebedu, Federal Route 21, is a major highway in Serian Division, Sarawak, Malaysia.[1] It is a dual lane road that is maintained by PPES Works Sdn. Bhd., a subsidiary of CMS Road. It connects Serian roundabout to Tebedu. Among other major destinations branched out from this route are Riih, Tebakang and Mongkos. It is a major route to West Kalimantan, Indonesia and is frequently used by people from both Malaysia and Indonesia to cross the border. Along this road are many scattered houses, privately owned orchards, churches, primary schools and chapels. It branches out to many small villages such as Kg. Kakai and Kg. Tian. GIATMARA institution of Serian district is also located here.
East Q144Serian-Tebakang Old Link Road Kg. Murud Balai Bomba dan Penyelamat Serian
T-junctions
Old Serian-Tebakang Road
East Q356Serian-Tebakang-Tebedu-Indonesian Border Old Link Road Kg. Tian
T-junctions
Serian-Tebedu district border
Baki-Riih
Northwest Q542Baki-Riih Road Pekan Baki Lama Kg. Riih Mawang Kg. Riih Daso Kg. Rituh Kg. Bantang Kg. Pichin Kg. Tanggak Kg. Tubih Kg. Tubih Mawang
T-junctions
Muara Mongkos Road
Northwest Q154Muara Mongkos Road Kg. Tebakang Dayak Kg. Tebakang Melayu Mongkos Q154-1Tebakang/Mongkos Junction-Sg. Nyanuh Bridge Q154-2Sg. Nyanuh Bridge Tebakang Bunan Kg. Bung Padus Kg. Bunan Gega Kg. Bunan Punok Kg. Gahat Mongkos Kg. Mapu Kg. Mapu Tragu Kg. Mentu Pondok Kg. Mentu Mawang Kg. Mentu Tapu