About: http://webisa.webdatacommons.org/247830408

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	Given that it will change of course when you run into surf, current, etc., but if you have a spring or other location you can measure a given distance, it would be a start.
http://www.w3.org/ns/prov#wasQuotedFrom	scubaboard.com