Assertion: lake's area | /r/HasProperty | reduced by its mean surface level
Facets:
Source sentences:
text: Although it is still one of the world’s largest bodies of inland water, in the second half of the 20th century its area was reduced by two-fifths and its mean surface level had dropped by more than 12 metres (40 feet), primarily as a result of the diversion of the Syr Darya and Amu Darya rivers for irrigating adjoining fields.