The boat flows smoothly forward.

[Tunnel of Sorrow]
Swarms of midges, colored a dull brown, swoop and dart along the reed-choked waterway. They seem to be feeding on curious growths along the riverbank - low-growing toadstools that ooze a sickly yellow slime. Some of the slime drips into the water from time to time, leaving a spreading slick upon the surface.
Obvious exits: none.