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You have to dig a hole to bury and it’s expensive to do that, for large enough holes.

Not really, most landfills use natural depressions or are hills instead of holes.

And in some very flat countries, those landfillhils become nice recreational landscape features, for example, the "Col du VAM"¹ in Drenthe, the Netherlands.

¹ https://www.drenthe.nl/locaties/61224200/vam-berg

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