The headwaters of the Elsire River flow in a series of waterfalls that drain the mountains back into the valley to the east. West of Sodden, the river is too rough and hides too many rocks for boats to navigate, though from Sodden, one can travel across the valley, going as far as Brindol. For most of its length, the Elsir averages 200 to 400 yards in width reaching depths of 20 to 40 feet in the middle of its channel. The small town of Elsircross is the first place downstream where it can be forded, although a wooden bridge spans the river at Brindol and ferries cross it at Talar and Drellin’s Ferry.
Schwalb, Robert J., “Siege of Bodrin’s Watch” Dungeon Magazine (August 2008)