Okjeo was a small tribal state which arose in the northern Korean peninsula from perhaps 2nd century BCE to 5th century CE. Dong-okjeo (East Okjeo) occupied roughly the area of the Hamgyŏng provinces of North Korea, and Buk-okjeo (North Okjeo) occupied the Duman River region. Dong-okjeo was often simply called Okjeo, while Buk-okjeo was also sometimes referred to as Chiguru (置溝婁, 치구루) or Guru (구루), the latter name being also applied… (More on Okjeo)