As the Mekong enters Cambodia, over 95% of its flows have already joined the river. From here on downstream the terrain is flat and water levels rather than flow volumes determine the movement of water across the landscape. The seasonal cycle of changing water levels at Phnom Penh results in the unique "flow reversal" of water into and out of the Great Lake via the Tonle Sap River. Phnom Penh also marks the beginning of the delta system of the Mekong River. Here the mainstream begins to break up into an increasing number of branches.
as the mekong enters cambodia over 95% of its flows have already joined the river from here on downstream the terrain is flat and water levels rather than flow volumes determine the movement of water across the landscape the seasonal cycle of changing water levels at phnom penh results in the unique "flow reversal" of water into and out of the great lake via the tonle sap river phnom penh also marks the beginning of the delta system of the mekong river here the mainstream begins to break up into an increasing number of branches