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

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

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

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

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

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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: www.bing.com/maps?cp=55.20521~-2.563028&lvl=17.4&…

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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.

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

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

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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. maps.app.goo.gl/HnfEDbE3nGbxviQ57