For waterways I find upstream/downstream more suitable to indicate direction of 
navigational channel. These terms are also represented in maritime maps and 
publications. counter_flaw, reversed, and backwards all seems odd for marine 

A typical description in a Pilots Guide (traffic descriptions for marine use) 
would be “Channel is used for upstream traffic”, and if not clear by 
navigational buoys, the map would have “Upstream channel” or similar term 
printed if not located in a sidenote on the map.
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