Cliffside: Mysterious shrub
Go into Spectator mode on Cliffside and look down the cliff at the beach. To the left, you should see a small crater on the beach where a mortar shell has hit. Fly down through the crater and keep going down. Eventually, you will go into some invisible water. Come up out of the water a bit and look around. You should see a large bush nearby in the mist. It is just floating there very far under the map.