Apart from his wall jumps and speed boosting abilities, Lúcio is well known for his Soundwave, which can knock enemies back. This is best used to knock enemies or groups thereof over cliffs to easily kill them.
Unfortunately, not every map is suited for that kind of strategy. For instance, the Temple of Anubis doesn't have bottomless pits of any kind, or if it does they're so out of the way that most players: enemies, allies, and Lúcio alike will only rarely venture there. At best, Lúcio can knock enemies off a bridge to make them lose precious seconds getting out of the crevice, or make it harder for them to hit.
I was wondering in which maps Lúcio could make his foes fall to death, preferably in locations where players are likely to pass through.