“Unknown canal” December 2016. Colmar. France. Canals and navigations are human-made channels for water conveyance or to service water transport vehicles. In the vernacular, both are referred to as 'canals', and in most cases, the engineered works will have a series of dams and locks that create areas of low speed current flow. These areas are referred to as 'slack water levels', often just called 'levels'.

Unknown canal

Gloss or Mat