To cross a stream, highway or valley (where the hold off attributable to a flight of locks at possibly facet might be unacceptable) the valley might be spanned by a navigable aqueduct – a renowned instance in Wales may be the Pontcysyllte Aqueduct (now a UNESCO Entire world Heritage https://msi-meg-z490-ace81234.elbloglibre.com/37205196/considerations-to-know-about-urso-fofo