A mountain of God is the mountain of Bashan; A mountain of many peaks is the mountain of Bashan.
Psalms 68:15
Surrounding context
68:14 When the Almighty scattered kings in it, It was white as snow in Zalmon.
68:15 A mountain of God is the mountain of Bashan; A mountain of many peaks is the mountain of Bashan.
68:16 Why do you fume with envy, you mountains of many peaks? This is the mountain which God desires to dwell in; Yes, the LORD will dwell in it forever.