About: http://webisa.webdatacommons.org/453429531

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	But if the river is speeding along in flood, and particularly if the boulder is then completely submerged, the result is a hole in fact as well as name, often with a steep wave breaking upriver at the downstream edge
http://www.w3.org/ns/prov#wasQuotedFrom	paddling.net