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Inland_waterways.

association	../conservation/water_quality.
association	Boat house
association	Fresh_water.
association	House_boat.
association	Surface_water.
association	Topography.
Conservation	../conservation/index.
EU Water Framework Directive	http://europa.eu.int/comm/environment/water/water-framework/overview.html
has_part	Canal
has_part	Dam
has_part	Estuary.
has_part	Lake.
has_part	Pond.
has_part	River basin
has_part	River.
has_part	Spring.
has_part	Stream.
has_part	Tarn.
has_part	Weir
is_type_of	Geography.
Ontology structure	Relation.