They used to trade with people pretty far away from where they lived, and so in this case, they were traveling by sea all the way to Mesopotamia, present-day Iraq.
И вели торговлю на больших расстояниях. Например, в данном случае они путешествовали по морю, до самой Месопотамии, т.е. сегодняшнего Ирака.