Solve the riddle:
I have water that you cannot drink, People come to see how in me the Sun sinks. I can be rough, I can be calm, I hold within myself plenty of charm. My depths tell a never-ending tale. Who am I with dolphins and the whale?
The answer is 'The Sea' or 'The Ocean'. The sea has salt water that cannot be drunk, people watch beautiful sunsets over it, it can be rough with waves or calm, it holds charm and mystery in its depths, and it is home to dolphins and whales.
Explanation
This riddle describes the sea or ocean. The clues include: undrinkable salt water, beautiful sunsets (Sun sinking), varying moods (rough or calm), mysterious depths with stories, and marine life like dolphins and whales. This connects to the chapter's theme of water bodies and boats.