At the head of this valley is Split-Mountain Canyon, 8 miles long, with ragged, craggy walls 2700 feet high.

It contains a number of medium rapids.

Island Park separates it from Whirlpool Canyon.
It is a charming little valley, full of islands, a mere expansion of the walls, 9 miles long,--9 miles of rainbow, for the surrounding rocks and marls are of every hue.

Whirlpool, 2400 feet deep, is about 14 miles in length and contains a number of rapids, but the whirlpools depend on the stage of water.

Then comes the beautiful little Echo Park, really only the head of Whirlpool.