This quick tutorial will show you how to (kind of) get rid of terrain anchors.
Step 1: Terrain anchors
Ok, first you need to find your terrain anchors.
Step 2: H O L E
Second, you need a hole that leads to a cave to put your terrain anchors in.
Step 3: Throw your terrain anchors away.
Thirdly, throw your terrain anchors into the hole. Note: You may have to push your terrain anchors down the hole by picking them up and dropping them because they may get caught on stuff on the way down.
Step 4: G O N E
Now your terrain anchors are in the hole and now the only sign of them being in your base are weird lines in the hole and beacons to let you know they are there and now step 5 occurs.
Step 5: enjoy life
now your terrain anchors are (kind of) gone now you can enjoy life!
Thanks to Bonez for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.