Earlier this calendar month Andrew Hill created a beautiful looking map of U.S. Rivers Colored yesteryear the Direction they Flow. Europeans instantly convey their ain river menstruation map.
Rivers of Europe is a CartoDB map showing alone European rivers. The map uses the same color system every bit Andrews' United States of America of America rivers map in addition to hence I assume that the European map every bit good colors each river yesteryear its direction of flow. If you lot click on the 'Datasets used inwards this map' you lot meet the information used inwards the map. The information includes a column for 'bearing' in addition to hence it is probable that that the rivers are colored yesteryear their direction of flow.