Final answer:
The river labeled in blue on the map is likely the Yangtze River, considering the presence of the Three Gorges Dam and its path through cities like Chongqing and Wuhan, with Shanghai near its delta.
Step-by-step explanation:
To determine which river is labeled in blue on the map you provided, we must consider the information given. The Mekong River originates in the Himalayas and runs through several countries before forming a delta in Vietnam.
However, if the river in question has significant features such as the Three Gorges Dam and runs through major cities like Wuhan and Chongqing, as well as a mention of Shanghai near its delta, then the river is most likely the Yangtze River. The Huang He, or Yellow River, is also a significant river in China known for its silt and historic importance but would not be our choice if the map highlights features associated with the Yangtze.