For #30DayMapChallenge#Day17's theme of "Flow", I shared this map of major rivers and ocean surface circulation patterns in the Salish Sea.
The flow of freshwater from land to sea and the flow of marine water from the Pacific Ocean into the Salish Sea create a complex pattern of estuarine circulation.
You can learn more in the Freshwater chapter of the Salish Sea Atlas (https://arcg.is/1jaWX80).