Assertion: drainage basin | /r/CapableOf | narrow at saratov
Facets:
value: in the south
type: LOCATION
value: sharply
type: DEGREE
Source sentences:
text: Its basin area or watershed is 752,443 square kilometers (532,821 square miles), stretching from the Valdai Hills and Central Russian Upland in the west to the Ural Mountains in the east and narrowing sharply at Saratov in the south.
text: The river basin drains some 533,000 square miles (1,380,000 square kilometres), stretching from the Valdai Hills and Central Russian Upland in the west to the Ural Mountains in the east and narrowing sharply at Saratov in the south.