Keep going right, even when you touch the other side.
Enter it a la the usual pipes, and you'll end up in the ship. With the help of a vine (unless you have the Space Jump ability or the Flight Petal or Dragon Petal), try jumping onto the speaker, and then jump on the top of the dead whale.
There is a secret pathway on top of the whale that leads to the inside of a ship in the second area, leading to the room before the boss fight.The level takes place inside the whale and is the first level to include acid. This is also where you can fight Umbreltar, the third boss of the game. My Name is Jonah is the seventeenth level in A Koopa's Revenge 2, or AKR2 for short.
Beat the level Confining Currents normally
