Which of these is MOST impacted by the construction of the Three Gorges Dam?

The river downstream of the Geo morphology and ecology was the most impacted.

Explanation:

The most impact here was felt the river downstream of the ecology relying to the biodiversity which resulted into the large number of fishes and the water security of the lower and the middle Yangtze.

Yangtze River located in Asia being the longest river was where the three dams where constructed.

A total number of 416 species of fishes were sustain as a result of the dams in Yangtze with other ancient species that was found there.