(English Muslim garden designer)
Islamic gardens always have water at their heart.
For a lush green garden with fountains and pools in a hot, dry country, you need to create a special place to which you can bring water by a canal. You need to build a wall round the place which is to benefit from this water, so dust and sand cannot blow in. So Islamic gardens are always rectangular and surrounded by a wall or screen which separates them from surrounding countryside or, in cities, from the streets.