Assertion: ark | /r/ObjectUse | used for river transport
Facets:
value: before slack-water canals
type: TEMPORAL
value: in eastern north america
type: LOCATION
Source sentences:
text: In early periods of North American industrial development, an ark was a temporary boat used for river transport in eastern North America before slack-water canals (a lock system and appropriate dams allowing two way travel) and railroads made them obsolete.