Changes of landscape in Lower Mekong basin, in territories of Viet Nam could be observable by using various historical remote sensing data and up-to-date. Geographic data with various sources compose of maps, aerial photos, satellite imagery and census data. Natural ecosystems are modified to human-made systems. Flooded forest area are severely declined both in Vietnam territory. Particularly, shrimp farms of saline aquaculture occupy almost mangrove areas. As a consequence, forest cover rate drops down 5.78 % for the entire Mekong delta (Vietnam) and regarding natural forests this rate is 1.4% only. Vast marshes, swamps and flooded forests have been drained by dense system of irrigation with canals and road-dikes to block flood of Mekong River to develop rices from one to three crops per year. Typically, this is seen at two areas of Dong Thap Muoi - Plain of Reeds and Long Xuyen Quadrant. All these make a new face of Mekong delta, it is waterscape of dense canal-dike network. In some areas, natural landscape has totally changed, the others are remained a few, regarding the area extent these only occupy less than 40 percent and it is considered as seminatural landscape.