Yarrow a "Water" bigger than a burn - smaller than a river. Den - valley certainly not a ravine. A few miles outside Selkirk in the Scottish borders (nowhere near Missouri). Occassionally stayed with a cousin who lived there and fished in it. Is a ballad more or less of a ballad if it is a "Child ballad" rather than a Scott ballad or a Burns ballad etc. from their collections obviously - not what they wrote - what they collected.