If your disc ends up heading towards the river, there are several natural "safeguards" that can hide your disc and make you think it's been lost in the drink. First, there are usually a ton of dead leaves that will slow down and "eat" a disc once you go right of the fairway. Second, there are fallen logs lining the edge of the cliff that collect leaves and can simultaneously catch and bury a disc. Finally, if you disc does make it to the river and you can't initially see it, check under the big log (with the big roots) and you'll likely find several caught discs (my record is 4).