Syria is comparatively rich in megalithic monuments, but it is remarkable that almost all of them lie to the east of the Jordan. Thus while there are hundreds of dolmens in the country of Pera and in Ammon and Moab, very few have been found in Galilee, and only one in Judaea, despite careful search. There is, however, a circle of stones west of Tiberias, and an enclosure of menhirs between Tyre and Sidon. According to Perrot and Chipiez some of the Moabite monuments are very similar in type to the Giants' Tombs of Sardinia. Others are simple dolmens. In a good example at Ala Safat (Fig. 22) the floor of the tomb is formed by a single flat slab of stone. The great cover-slab rests on two long blocks, one on either side, placed on edge. The narrow ends are closed up with smaller slabs, one of which, that which faces north, has a small hole pierced in it. A similar closure slab with a hole is also found in certain rock-tombs quite close to this dolmen. Apparently none of these dolmens have been systematically excavated, and nothing is known of their date. [Illustration: FIG. 22. Dolmen with holed stone at Ala Safat. (After de Luynes.)] Menhirs, too, are not wanting in Syria. Perrot and Chipiez figure an example from Gebel-Mousa in Moab which is quite unworked, except for a shallow furrow across the centre of the face. In many cases the menhir is surrounded by one or more rows of stones. Thus at Der Ghuzaleh a menhir about 3 feet in height is set in the centre of what when complete must have been a rectangle. In other cases the enclosure was elliptical or circular in form. In an example at Minieh the menhir stands in the centre of a double (in part triple) circle of stones, on which abuts an elliptical enclosure. In some cases the circle has no proper entrance, in others it has a door consisting of a large slab resting on two others. The largest of the circles attains a diameter of 600 feet, and has a double line of stones. Within these circles and near them are found large numbers of monuments consisting each of a large flat slab resting on two others. On the upper surface of the top slab are often seen a number of basin-shaped holes, sometimes connected by furrows. Many of the slabs are slightly slanting, and it has been suggested that the series of holes and furrows was intended for the pouring a libation of some kind. In a monument of this type at Amman the cover-slab slopes considerably; the upper part of its surface is a network of small channels converging on a hole 11 inches deep about the centre of the slab. Here, again, no excavations have been carried out, and we do not even know what was the purpose of these structures. It is, however, probable that these trilithons were not, like the dolmens, tombs, but served some religious purpose, possibly connected with the worship of the menhirs.