They did an incredibly job finding unique filming locations across Northumberland.

0:05 https://youtu.be/IYGG55qwQZQ?t=5

The opening scenes are filmed in the maintenance tunnel beneath the dam at Kielder Water https://maps.app.goo.gl/UypK6WEymBMgVwTp9

0:25 https://youtu.be/IYGG55qwQZQ?t=25

The island scenes are filmed on Lindisfarne/Holy Island, although it looks like they’d heavily edited the layout and re-arranged it https://maps.app.goo.gl/HwWQGx6Ciqtqusoq6

0:30 https://youtu.be/IYGG55qwQZQ?t=30

River scenes are filmed at Plankey Mill / Allen Banks and Stawards Gorge https://maps.app.goo.gl/d5xcQ961bk9yA5p79

0:38 https://youtu.be/IYGG55qwQZQ?t=38

Lindisfarne again. Note the castle has been removed from the background.

0:53 https://youtu.be/IYGG55qwQZQ?t=38

I’m not sure where the beach scene is. I’m not aware of a forest right on a sandy beach like this in Northumberland so I suspect it might be heavily edited. They were filming at Matthews Linn in Kielder Forest so there’s a possibility it is here: https://www.bing.com/maps?cp=55.20521~-2.563028&lvl=17.4&style=h

0:59 https://youtu.be/IYGG55qwQZQ?t=59

I have no idea where the abandoned house is. They were filming somewhere along the Forest Drive at Kielder so it could be in that area.

1:13 https://youtu.be/IYGG55qwQZQ?t=73

The stony beach is just below Hawkhope Car Park by the dam at Kielder Water https://maps.app.goo.gl/YNrGnMepoeeF1fVP8

1:14 https://youtu.be/IYGG55qwQZQ?t=74

The following scene with the high concrete walls are filmed inside the spillway beside the dam. https://maps.app.goo.gl/9h2aoLdx9hXfMDdh7

1:20 https://youtu.be/IYGG55qwQZQ?t=80

They re-painted this abandoned petrol station at Knowesgate to become the Happy Eater. This is my personal favourite because despite them going for a dystopian, abandoned aesthetic they literally made it look better. https://maps.app.goo.gl/HnfEDbE3nGbxviQ57