or Sla, a seaport of Morocco, on the Atlantic coast, at the mouth of the Bu Regreb, on its northern bank, opposite to Rabatt on the southern; N. Lat. 34° 3', W. Long. 6° 50'. It is strongly fortified, but not very well built; there are several batteries which command the entrance to the river. It has a harbour, roadstead, magazines, and marine arsenal; and is the principal station of the fleet of Morocco. As a commercial town, it is still thriving, though a portion of the trade has been transferred to Mogadore. Sallee was once notorious as a haunt of pirates, but this is no longer the case. Carpets are made here. In the vicinity are many fine gardens. Pop. 25,000.