The woman, in her 50s, stepped on a mine "planted by jihadists" and died of internal bleeding after straying about one kilometre (mile) into the Mount Salloum military zone, the official told AFP.
Mount Salloum, in the Kasserine region near the border with Algeria, is a stronghold of jihadists.
There have been several deaths from landmine blasts in the region. On Monday a Tunisian soldier died of his wounds on Mount Ouergha, also in the west of the country.
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