The border between the arch-rivals has been closed since 1994, but Algeria had allowed some residents of the Moroccan frontier town of Figuig to cross into the date groves of Al-Arja, known to Algerians as the Laaroda oasis.
In recent days, Algeria has withdrawn that right, deploying soldiers to enforce the move.
“Everybody feels wronged,” said Mohamed Jabbari, an unemployed 36-year-old who joined a protest in Figuig against the move.
“Agriculture is the only resource we have. There’s no work here, no factories.”
On Thursday, some 4,000 people — around half of Figuig’s population — attended an angry demonstration against Algeria’s decision.