http://registro.idee.es/codelist/DesignationSchemeValue/hydrologicalReserves:1http://registro.idee.es/codelist/DesignationSchemeValue/hydrologicalReservesenRivers, river sections, lakes, aquifers, bodies of water or parts of bodies of water, declared as such given their special characteristics or their hydrological importance for their conservation in their natural state.