In Jewish halacha, the techum shabbat (Hebrew: תחום שבת, "Shabbat limit"), or simply techum, is a limited physical area in which a Jew is permitted to walk on foot on Shabbat and Jewish holidays. In general, this area is calculated by measuring 2000 cubits (about 1 kilometer) in every direction from the place (or settlement) where a person was located when Shabbat began.
One may extend this limit for an additional 2000 cubits in one direction, using a procedure known as eruv techumin.