River Dea is the largest and longest river in Shintolin. The river is so wide that a person has to know how to swim in order to cross the river thus making it a "dividing force of the world" for low-leveled players. River Dea flows from Hermit Lake into an ocean, forming curves when it passes through Latis Plains. In Latis Plains a player has to be aware that certain areas suffer from flood every Spring so watch your feet. It has to be noted that River Dea has a tributary - Border River, a river flowing from Strongholm Marshes and through Lake Bokrug (also known as Border Lake).