To some extent it may be said that true North Africa lies to the north of the Jerid country, which, besides its Saharan, Arabian and Persian affinities, has a touch about it of real Africa, some such touch as may be observed in the valley of the Jordan.
To the south of the Jerid the country is mainly desert - vast unexplored tracts of shifting sand, with rare oases.
In the oases of the Jerid are found several species of tropical African mammals and two or three of Senegalese birds, and the vegetation seems to have as much affinity with tropical Africa as with Europe.
With this country of Jerid may be included the island of Jerba, which lies close to the coast of Tunisia in the Gulf of Gabes.
The present writer believes that the date palm was really indigenous to this district of the Jerid, as it is to countries of similar description in southern Morocco, southern Algeria, parts of the Tripolitaine, Egypt, Mesopotamia, southern Persia and north-western India; but that north of the latitude of the Jerid the date did not grow naturally in Mauretania, just as it was foreign to all parts of Europe, in which, as in true North Africa, its presence is due to the hand of man.
The principal mineral springs of medicinal value are those of Korbus and Hammam Lif (of remarkable efficacy in rheumatic and syphilitic affections and certain skin diseases), of the Jerid and Gafsa, of El Hamma, near Gabes, and of various sites in the Kroumir country.
They are met with in a long strip of country south of the Majerda, between the Algerian frontier and the sea-coast north of Susa; also inland, to the south-west of Susa, and near Kef; also in another long strip between the vicinity of Sfax on the north and the Jerid on the south.