I was just wondering, how big are the rivers in Felarya surposed to be? Keeping in mind that Felarya is a gaint world, what would seem to a typical river to gaints would an ocean to human sized characters, which only raises questions of the practicality of trying to cross one in a boat, not only could it take several hours to cross (and thus you have to put up with any mermaid attacks for that long) but the river currents would be over 100 times stronger than any river we know of, the rivers by themselves could be enougth to kill you and destroy most sea worthy ships....unless your ship is a Felarya tree branch
Of course there are bridges in Felarya like the one at Negav, but if the Motamo river is also huge, then how big is the Negav entrance bridge? The size of the channel crossing?
Of course the rivers in Felarya might not really be rivers from the gaint perspective, they could just be small creeks or streams. it's just that from a human's perspective a Felarya stream is big enougth from their perspective to be a river, and since humans made the maps, they called them rivers.
But then if they were just streams, Mermaids would stick out like a sore thumb because they would be barely submerged in the shallow (from their perspective) water.
Or it could be a combination of both, rivers such as the Chordoni river are massive from human's perspective while the Motamo river by Negav is much smaller to allow Negav to have what would seem for humans to be a traditional sized bridge.