To cross a stream, street or valley (wherever the hold off attributable to a flight of locks at possibly facet can be unacceptable) the valley might be spanned by a navigable aqueduct – a popular case in point in Wales would be the Pontcysyllte Aqueduct (now a UNESCO Earth https://ursofofo85173.blogchaat.com/37295962/the-fact-about-musica-infantil-that-no-one-is-suggesting