Assertion: trumpeter swan's nest | /r/LocatedNear | a 20 to 30 foot
Facets:
value: often
type: TEMPORAL
Source sentences:
text: The nest is often surrounded by a 20 to 30 foot (6 to 9 meter)ditch - usually filled with water to make it more difficult for mammalian predators to access the nest.
text: The nest is often surrounded by a 20 to 30 foot (6 to 9 meter) ditch - usually filled with water to make it more difficult for mammalian predators to access the nest.