To cross a stream, road or valley (where the hold off because of a flight of locks at both aspect could be unacceptable) the valley could be spanned by a navigable aqueduct – a renowned example in Wales is the Pontcysyllte Aqueduct (now a UNESCO Planet Heritage Website) over https://canalinfantil79888.arwebo.com/59500365/little-known-facts-about-musica-infantil