Urban Planning in the Context of the Saudi Urban Identity (Case Study: Hail City) Urban Adaptation Between Contemporary Residential Schemes and Heritage Area (Case Study: Al Dir'iyah-Riyadh) Environmental Adaptation for Urban Patterns with New Residential Districts in Riyadh City Environmental Adaptation for the Development of Jizan City Coast in Saudi Arabia The Coastal City Planning in the Regional Context, (Case Study: Hurghada, Egypt and El Wajh, Saudi Arabia)