Both the geographic area designated by and the political status of the name have changed over the course of some three millennia. The region, or a part of it, is also known as the Holy Land and is held sacred among Jews, Christians, and Muslims. In the 20th century it has been the object of conflicting claims of Jewish and Arab national movements, and the conflict has led to prolonged violence and in several instances open warfare. The name Palestine has long been in popular use as a general term to denote a traditional region, but this usage does not imply precise boundaries. The perception of what constitutes Palestine's eastern boundary has been especially fluid, although the boundary frequently has been perceived as lying east of the Jordan River, extending at times to the edge of the Arabian Desert.
Settlement is closely dependent on water, which is almost never abundant.
The rainfall, which arrives in the cool half of the year, decreases in amount in general from north to south and from the coast inland. Perennial rivers are few, and the shortage of water is aggravated by the porous nature of the limestone rocks over much of the country.