Example : Where is the hut?
The hut is between river and mountain.
'Could' is the past tense of 'can'. It is to show the ability and politeness. The negative form is 'couldn't'.
Example : Could you swim toward the boat?
Yes, I Could./No, I Couldn't.
Both questions above need preposition of place: between, through, past, near, over, etc.
Do the exercise below!