Is not God in the height of heaven? and behold the height of the stars, how high they are! And thou sayest, How doth God know? can he judge through the dark cloud? Thick clouds are a covering to him, that he seeth not; and he walketh in the circuit of heaven.
God is in heaven, above the dark cloud. This is speaking of the covering that Isaiah referred to as being like sackcloth.
Heaven is a circuit, an orbit of the earth, a sphere on the edge of space.