What does the blue land mean?

Meaning: It is the general name of the image of coastal countries' internal waters, territorial waters and jurisdictional waters. The sea area under jurisdiction includes the contiguous zone, exclusive economic zone, continental shelf, historical sea area or traditional maritime boundary outside the territorial sea.

Introduction: Before modern history, "Kingoma Iron" was once the name of a powerful empire. After 1840, coastal countries opened up many times, and China began to pay attention to the ocean amid the noise of the dispute between "blocking defense" and "coastal defense". The concept of blue land has long been deeply rooted in people's hearts. China has a land area of 9.6 million square kilometers. People all over China should form an idea that we still have 3 million square kilometers of blue land.