THE ESTUARIES OP JIBAN 43 the cliffs ran south-west to unite at no great distance in a narrow bay forming the landward head of the depression. From this head the estuary—that seems the most appro- priate term to use in connection with these Jiban depres- sions—splays out delta-wise towards the sea in a north- easterly direction, the prominent headland of Ri' al Hamda forming the seaward extremity of the northern cliff as it does of the southern fringe of Jaub al Hirr.1 The true channel of the estuary runs north-eastward along the northern cliff to the vast salt-flats that extend to the waters of the Gulf of Bahrain, while on the southern side of the valley a series of broad rock-steps, Kberally covered with dunes and ridges of sand, descends towards the salt-flats from the Ba'aij head- land. Salwa lay about NNE. of our point of observation though its palms and the sea were invisible to us in the after- noon haze. And here and there on the flanks of the channel strangely eroded stacks2 of rock stood out as evidence of the progressive denudation and weathering of the cliffs, of which doubtless they once formed part. One of these fragments, known as Naslat al Tarad or c the rock of the battle/ pre- serves the memory of a famous tribal encounter of some 30 or 35 years ago when 'Ali Jahman was a child. It was fought between the Murra, who were in possession of the wells, and the'Ajman, who entered the depression at, and launched their attack from, this rock. The battle was stubbornly waged throughout the day and in the end victory rested with the home tribe, the Murra, who had as many as 50 casualties to mourn, while the losses of the defeated 'Ajman were very much heavier. That was in the good old days when cavalry still counted in Arab warfare, but now the modern rifle has deleted the horse from such affrays, while the thirty years' peace of Ibn Sa'ud has all but eliminated war from the nor- mal programme of the tribes. Gone are the days of horse- breeding among the warlike Hurra, for now, as like as not, if any man have a mare worth 'having she will inevitably drift into the stables of Ibn Jiluwi, as fine a judge of horse and camel flesh as lives to-day in Arabia, and a tiger, they 1 The word Jaub (plur. Jiban} signifies a depression. 2 Such isolated rocks are called Naala.