First of all, having two fields named "id_land" in table 1 won't work, so I'll use "uid" in this example for table 1's primary key.
Try this:
SELECT
table1.uid AS uid,
table3.regisseur AS regisseur,
table2.land AS land
FROM
table1,
table2,
table3
WHERE
table1.id_regie = table3.id_regie AND
table1.id_land = table2.id_land;