"I woke up in the middle of the night, and saw something glowing out near some unpopulated islands. I thought I was just seeing things at first, but then the lights started moving around in these weird patterns..." - An anonymous Sailor
The Wisps are almost directly vertical in position from the King's Hideout along the dark cloud border that is accessible once the great net has been removed. Since the islands in this area mostly have discoveries on them, it's not that difficult to miss. If you look closely at the lights, they make the image of Loopers.