I want to know the answer to the following question:
What is the name of the area of land around Nanjing?
All the background I'm provided with is that "Nanjing, with a total land area of 6,598 square kilometres (2,548 sq mi), is situated in the heartland of drainage area of lower reaches of Yangtze River, and in Yangtze River Delta, one of the largest economic zones of China.". Is that enough to answer the question?