Where was the crab caught?

There are many primitive crabs on the right side of Guyunge and Wangfengjiao. And the island I went to when I was doing the world mission of Time and Wind, the nameless island. There are many crabs on the island, and about 20 crabs can be caught at a time. You can put a transmission anchor there to catch crabs. The number is very large. You can catch crabs for a month and use them for a long time.