Today's prompt was 'river barge'.

Mondays are for the world23 environment, local geology, weather, flora or fauna. Something about the Grey Flood, I'm sure, and river traffic. There were river dragons of a sort on the Grey Flood, giant otters, otters of unusual size, man-eaters, but they were exterminated, hunted to extinction to protect humans and their livestock and to make the river safe for trade... 

The last one was supposed to have been slain in the Kings' grandfathers' day, or so they say.