Marial Bai is a village in Northern Bahr el Ghazal state, South Sudan.
Majak Baai lies alongside river Lol as you coming from Tueng. It is the real-life hometown of Aaron Yaivek, Makuach Mou Marial and Mou Ayol. Devastated during Sudan's second civil war, Majak Baai now benefits from the efforts of the Majak Baai Community together with diaspora community , which has constructed a new Mayom Angok Headquarter.