Water in play directly behind short pin (before the long pin location) and not visible from the tees. Usually a muddy hole up to 2' deep and 10-15' across. Lay up to avoid the murky stuff.
Watch for sink holes on both sides of the pin. Keep your disc straight to avoid them. If you can not throw straight then throw long. Past the pin is better than losing a disc in the sink holes you cannot see till its to late.