Assertion: terrestrial planet's canyon | /r/Synonym | agathadaemon
Facets:
value: in the old canal maps
type: LOCATION
Source sentences:
text: The large canyon, Valles Marineris (Latin for "Mariner Valleys", also known as Agathadaemon in the old canal maps), has a length of 4,000 km (2,500 mi) and a depth of up to 7 km (4.3 mi).