The Temple Of Naga Is In The Sagathian Moors. When You Enter The Sagathian Moors Go North Then West Then South. If You Use The Map The Temple Is In That Opening Section That Is Around The Brown Section Of The Map That Looks Looks A Head.
Naga temple is to the far west of Skuldoon, through the Sagathian Moors swamp. When you enter the Moors, follow the west mountains and they will lead you there.