Actually, only one of these cities would be enough to answer the question, as they both lie only on the sea: the Baltic sea.
The Baltic sea joins the Atlantic Ocean next to Denmark.
What question are you asking
The answer is false. Mongol rulers were definitely not nonviolent, but they were mostly fair leaders. Ghengis Khan, for example, would give the families of dead soldiers money so that they would be able to survive without the family member.
Hope this helps! Please let me know if I missed something. :)
Answer:
I'm not sure but it could be financial stability