Rivers are inherently interesting. They mold landscapes, create fertile deltas, provide trade routes, a source for food and water; a place to wash and play; civilizations emerged next to rivers in China, India, Europe, Africa and the Middle East. They sustain life and bring death and destruction. They are ferocious at times; gentle at times. They are placid and mean. They trigger conflict and delineate boundaries. Rivers are the stuff of metaphor and fable, painting and poetry. Rivers unite and divide - a thread that runs from source to exhausted release.