Assertion: county's river | /r/CapableOf | drain triangular area
Facets:
value: broadly
type: DEGREE
value: in its upper course
type: TEMPORAL
Source sentences:
text: In its upper course the river drains a broadly triangular area defined by the chalk escarpment of the Chiltern Hills and the Berkshire Downs to the east and south, the Cotswolds to the west, and the Northamptonshire uplands to the north.