To cross a stream, street or valley (where by the hold off caused by a flight of locks at possibly facet can be unacceptable) the valley might be spanned by a navigable aqueduct – a popular instance in Wales will be the Pontcysyllte Aqueduct (now a UNESCO Entire world https://cristianmuycf.blog2learn.com/84697192/little-known-facts-about-musica-infantil