It's called "draft". Draft is the distance from the waterline to the bottom of the ship.
The part of a river that is underwater when the river overflows its banks is called the flood plain.
The main part of the boat that you walk on is called The deck. Usually known to have the best view on the boat.
Flood Plains
upper deck
Yes the 'bow' is the front of the boat and the back of the boat is called the 'stern'. bow is in the front its the ponity part of the boat, the stern is all of the back of the boat.
The front part of a boat or a ship is called bow.
The bottom of a car
Hull Is The Inside or bottom(?), and deck is the top. other than that i thinks its just called a boat. My best answer would be hull.
It is known as a trench, which is the lower part of the ocean. The deepest trench is the Marina Trench.
One part of a boat is called a rudder.
front of boat = bow (rhymes with cow) back of boat = stern
The bottom of the boat is called the keel. Attached to and atop that is the hull, part of which is below the waterline, part above. Unless you're talking about a little ol' flat bottomed dinghy -- then the bottom is just called the bottom.