If there are reed or timber there are probably some there, but I agree, flats are good. I usually make guess as to where to start. Fish 5 or so minutes then move a little ways and drill again, and again and again. You'll find them. They do move around a bit. Drop-offs don't usually work fo me, but it you get up onto the bar or flat abover or below it can be good. Then too, a little hump or a little dip in a larger flat can be hot.