In some other place or location.
The word otherwhere is not used very often and can sound old-fashioned or like it's from a story.
Examples:
She wondered what it was like otherwhere.
The treasure was hidden otherwhere.
He wanted to go otherwhere for his vacation.
I think the cookies are hiding otherwhere!
Otherwhere, the sky is always purple and the grass is always blue.
Otherwhere, the animals can talk and the trees can walk.