The Chasm
The Chasm is in Presto's Edge.
It is the large canyon on the right side of the area with a bridge going over it. There is a trick to getting into the Chasm.
You need to use your levitation power to hover over the chasm and then let it run out to drop down into it.
Dizzy TV in The Chasm
Once you are in the Chasm you can do certain missions that take place there and well as find the Dizzy TV.