Answer:
Salty water everywhere but not sea in sight.
What can be swallowed, but can swallow you?
What is that you will break everytime you name it?
I have an eye but cannot see, You'll head inside when you see me.
This only turns over once you have travelled very far. What is it?
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.