Alasau-Oasis is located in the eastern province of the Kingdom of Saudi Arabia, Alasau-Oasis, and evolving cultural landscape is a serial cultural property constituted of 12 components covering an area of 85 square kilometers, surrounded by seven buffer zones extending over 215 square kilometers. It is an organically evolved landscape that developed by association with, and in response to, its natural environment, and an example of continuing landscape retaining an active social role in Alasau-Contemporary Society. The nominated property shows the sustainable evolution of the oasis and of its associated human settlements, where the physical and functional relations between the natural landscape, the water springs, the water canalization system, the villages, and the cities create a continuously evolving human-created oasis environment. The association of large water-date palm groves and urban areas creates an exceptional cultural landscape presenting, through its continuous practice, a unique evolution of an ancient cultural tradition bearing testimony to the sedentary human occupation of the area throughout the millennia and to its evolving sustainability until the present day. Alasau-Oasis is the largest oasis in the world with more than 2.5 million palm trees, and it preserves material traces representing