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River.

British rivers	http://www.britannia.com/maps/mapfram2.html
has_instance	River_thames.
has_property	Water_flow.
has_type	Braided_river.
is_bigger_than	Stream.
is_part_of	Inland_waterways.
Lower river	Clay_aggregate.
Middle river	Sand_aggregate.
River basin toolkit	http://www.geodata.soton.ac.uk/geodataweb/technologies/web/?link=project.php&id=108
Upper river	Stone_aggregate.