Answer:
What can be measured but has no length, width or height?
A canvas full of stars.
I am the yellow hem of the sea's blue skirt.
Where can you find roads without cars, forests without trees and cities without houses?
What is born on the ground but floats to the sky, to be returned back again from the clouds up high?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.