The 246th prohibition is that we are forbidden from stealing the boundaries of land, i.e. altering the line between our property and our neighbors', thereby enabling a person to claim that the other person's land is his own.

The source of this prohibition is G‑d's statement1 (exalted be He), "Do not move your neighbor's boundary marker"

The Sifri says: "It is already written 'You may not steal.' Why was it necessary to write the verse 'Do not move your neighbor's boundary marker'? To teach that anyone who moves his neighbor's boundary marker transgresses two prohibitions. You might think that this applies even outside Israel. The verse therefore continues ' your inheritance in the land [that G‑d your L‑rd is giving you to occupy]' — in Israel it counts as two transgressions, but elsewhere it counts just as one." This [one transgression] refers to the prohibition "You may not steal." It is therefore clear that the Biblical prohibition applies only in Israel.