Marial Bai is a village in Northern Bahr el Ghazal state, South Sudan.

Marial Bai lies between the Magadhik River and Chel or Kuru River, which converge to form the Lol River.

[1] It is the real-life hometown of Valentino Achak Deng, the protagonist of the Dave Eggers book, What is the What.

[2] Devastated during Sudan's second civil war, Marial Bai now benefits from the efforts of the Valentino Achak Deng Foundation, which has constructed a new Marial Bai Secondary School.

[3] [4] This South Sudan location article is a stub.