To cross a stream, street or valley (in which the delay caused by a flight of locks at possibly aspect might be unacceptable) the valley might be spanned by a navigable aqueduct – a popular example in Wales is the Pontcysyllte Aqueduct (now a UNESCO Environment Heritage Web-site) over https://musicainfantil35544.bloguetechno.com/the-single-best-strategy-to-use-for-musica-infantil-72542412