The Yangtze Delta is an area in China where a really big river called the Yangtze River flows into the ocean. This area is really special because it has a lot of big cities, like Shanghai and Hangzhou, where lots and lots of people live and work. The people who live in the Yangtze Delta do lots of important things like making things in factories, growing food on farms, and trading goods on big ships that sail on the river and the ocean. The Yangtze Delta is like a big playground for the people who live there, because there is so much to explore and do!