Many holes have no OB, however there are some Hazards marked by RED FLAGS
General layout notes
Revised Rule for Roller Shots Rollers are allowed. If, after its first ground contact, the disc travels more than 50 feet (intentional or not), you must relocate the lie. To relocate, measure 45 feet (about 15 paces) straight back toward the tee from the disc’s first point of ground contact and place the disc there. The relocated lie may not be closer than 45 feet to the basket under any circumstance.