Dig a hole to get some landfill, resulting in a hole of water. Then you can replace the land somewhere else...
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
can no longer craft landfill without land mover installed and active.
I think you installed this mod, and then removed it again mid-game? After removing the mod, you can get your vanilla recipe back by running
/c game.player.force.reset_technology_effects()
Kind regards lovely_santa