Answer:
The largest source of Asteroids is the Kuiper Belt.
Because of that, the Kuiper is larger than the Asteroid Belt. With that said, the Kuiper Belt is 20 times as wide and 20–200 times as massive than the Asteroid Belt, which means that there are billions of Asteroids out there.
The Kuiper Belt's location is beyond Neptune. 50 AU (Astronomical Units) away from the Sun.
Hope it helps!
