Duanu tribe is community of laut tribe or sea people where located in Muara Sungai Indragiri Hilir, also part of Kelompok Adat Terpencil (KAT), it is a part of Ras Proto Melayu (Melayu Tua). Duanu tribe have an unique tradition, that is Menongkah Kerang. Menongkah Kerang is technique of Duanu tribe to looking for shell in muddy beach when the receding of sea water coming using piece of board th…