Assertion: sea's water | /r/HasProperty | obtained for example
Facets:
value: from river lea
type: LOCATION
value: from the river thames
type: LOCATION
value: mostly
type: DEGREE
Source sentences:
text: Water in London, for example, is mostly obtained from the River Thames and River Lea both of which derive significant proportion of their dry weather flow from springs in limestone and chalk aquifers.