Cheonghaejin
Cheonghaejin ( literally "Blue sea headquarters" ) was a major military headquarters and trading hub located on Wando island , South Jeolla province of South Korea , and established by Korean general Jang Bogo in 828 ACE during the Silla kingdom period . 
<triplet> Cheonghaejin <subj> Wando <obj> located in the administrative territorial entity <triplet> Wando <subj> South Korea <obj> country <triplet> South Jeolla <subj> South Korea <obj> located in the administrative territorial entity <triplet> South Korea <subj> South Jeolla <obj> contains administrative territorial entity