Two of their characteristics make them especially eye-catching:
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They follow the roads closely, and are located near the roadside.
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They are marked by trees; some have only a single tree, while in other places a cluster of limans can be found, each supporting a small grove of trees extending over an area of up to ten dunam (approx 2.5 acres).
The liman’s trees are dependent upon the runoff areas that support them. But these runoff areas also fulfill an important aesthetic function: the limans can be regarded as unique features of the landscape when viewed against the background of the desert expanses. Because of this, the open ground adjacent to the liman is defined for the purposes of this article as “landscape-contributory.”
The landscape-contributory area is important because of the stark contrast it provides to the limans, which are thrown into sharp relief as the only green elements in the desert. When they appear amidst other elements such as forests and woodlands, buildings or agricultural land, the limans fade into the background and almost disappear. This means that the conservation of landscape-contributory runoff areas is of vital importance, as they emphasize the limans’ role as small shady groves in the middle of the desert.
The limans were planted using runoff water collected by time-honored methods current in arid areas of the ancient world. Since the nineteen-eighties the planting and maintenance techniques used at the limans have improved significantly as a result of monitoring, research and accumulated experience. The professional theory that for many years determined the way liman groves were planted was based upon forestry and hydrological considerations alone, with no regard for landscaping, and so it is hard to discern any aesthetic reasoning behind the size or species of tree selected for each location or for the roadsides adjacent to the limans (see map of liman distribution by size, and map of distribution by tree species).
In appearance the limans conform to the UNESCO definition of “designed landscape” features, i.e., features that have been deliberately designed and created by human hands (UNESCO 2002).