What type of engine is common on boats designed for shallow water?

Jet drives is engine that is common on boats designed for shallow water.

Boats can have inboard or outboard jet drives. The jet drive draws the water from under the boat through an intake and into a pump - jet inside the boat. The difference between the jet boat and the powerboats or motorboats is that powerboats and motorboats have use an external propeller, while the jet boat draws the water from under the boat