36 M. NARROW GAUGE RAILWAY in 2¼–2½ hrs. (6 fr. 50, 4 fr. 95, 3 fr. 50
c.; return 9 fr. 10, 6 fr. 95, 4 fr. 90 c.). Passengers from Tunis
(return-fares 30 fr. 25, 22 fr. 95, 16 fr. 25 c.) change at
Kalaâ-Srira (Rail. Restaurant).
From Susa to (5 M.) _Kalaâ-Srira_, see p. 366. The line runs, nearly in
the same direction as the Susa and Tebessa (p. 315) Roman road, to the
S.W., on the right bank of the _Oued Laya_ (p. 366), to the (8 M.)
_Réservoir_ of the Susa waterworks.
At (10 M.) _Oued-Laya_, a small oasis of fruit-trees and vegetables, the
olive-zone of the Sahel ends. 17½ M. _Kroussiah-Sahali_. 23 M. _Sidi
el-Hani_, not far from the ruins of _Vicus Augusti_ (_?_).
To the left, farther on, we obtain a glimpse at the _Sebkha Sidi
el-Hani_, 25 by 12½ M., the largest salt-lake of central Tunisia. To the
right, a little farther on, beyond a chain of flat hills, is revealed a
striking view of the vast _Plain of Kairwan_, enclosed by distant
mountains, with the town of _Kairwan_ in the background. The low ground,
through which the _Oued Hathob_ (p. 320), _Oued Merguellil_, and many
smaller streams descend from the Sahara Atlas and its plateaux to the
_Lac de Kelbia_ (p. 320; not visible from the train), is often flooded
after the winter rains. It is inhabited almost exclusively by the
Arab-like nomadic tribes of the _Djlass_ or _Zlass_. The train runs
through plantations of Indian figs.