Siege Overhaul - A Villager Recruits Addon

Your perimeter wall can now cross ponds, rivers, shallow sea and even lava.

Before building, your builders fill the water under the wall (and a couple of blocks around it) with dirt, so the wall sits on flat ground at the water's surface. Kelp and seagrass in the way get cleared too.

The dirt comes from your builders' storage, the same chests and barrels they use for other materials. The plan tells you how much dirt it needs ("+N dirt to fill water") and asks you to stock it first if there isn't enough. Nothing is charged until the job really starts.

Water up to 8 blocks deep can be filled. Deeper water is still refused and the message tells you where. Server owners can change the depth (or turn this off) with the new perimeterWaterFillDepth setting.

Walls along a shoreline are also no longer refused just because there's water right next to them.

Back up your world, and update the server and every client together.