▁A ▁in ▁which ▁he ▁places ▁China ▁and ▁the ▁Dutch , ▁" wh ose ▁relations ▁fell ▁under ▁the ▁direct ▁juris diction ▁of ▁the ▁Bak uf u ▁at ▁Nag as aki " ▁and ▁Group ▁B , ▁represented ▁by ▁the ▁Korean ▁Kingdom ▁and ▁the ▁Ry ū ky ū ▁Kingdom , ▁" who ▁de alt ▁with ▁Ts ush ima ▁( the ▁S ō ▁cl an ) ▁and ▁S ats uma ▁( the ▁Sh im azu ▁cl an ) ▁domains ▁respectively ". ▁ ▁Many ▁items ▁trad ed ▁from ▁Japan ▁to ▁Korea ▁and ▁the ▁Ry ū ky ū ▁Kingdom ▁were ▁eventually ▁sh ipped ▁on ▁to ▁China . ▁In ▁the ▁Ry ū ky ū ▁Islands ▁and ▁Korea , ▁the ▁cl ans ▁in ▁charge ▁of ▁trade ▁built ▁trad ing ▁towns ▁outside ▁Japanese ▁territory ▁where ▁commerce ▁actually ▁took ▁place . ▁Due ▁to ▁the ▁necessity ▁for ▁Japanese ▁subjects ▁to ▁travel ▁to ▁and ▁from ▁these ▁trad ing ▁posts , ▁this ▁res emble d ▁something ▁of ▁an ▁out going ▁trade , ▁with ▁Japanese ▁subjects ▁making ▁regular ▁contact ▁with ▁foreign ▁trad ers ▁in ▁essentially ▁extr ater rit orial ▁land . ▁Com merce ▁with ▁Chinese ▁and ▁Dutch ▁trad ers ▁in ▁Nag as aki ▁took ▁place ▁on ▁an ▁island ▁called ▁De j ima , ▁separated ▁from ▁the ▁city ▁by ▁a ▁narrow ▁stra it ; ▁foreign ers ▁could ▁not ▁enter ▁Nag as aki ▁from ▁De j ima , ▁nor ▁could ▁Japanese ▁enter ▁De j ima ▁without ▁special ▁permission ▁or ▁authorization . ▁For ▁the ▁island ' s ▁inhabitants , ▁conditions ▁on ▁De j ima ▁were ▁hum ili ating ; ▁the