Employer is a type of Leader. you are likely to find Leader in/at/on Country. 
Rest is related to Back. Back is the opposite of Current. Current is related to Ocean. you are likely to find Salt in/at/on Ocean. 
Employer --IsA--> Leader --AtLocation--> Country 
Rest <--RelatedTo--> Back <--Antonym--> Current <--RelatedTo--> Ocean <--AtLocation-- Salt 