Suppressing his anger, Brown began to explain the situation to Soren.
Due to the staggering number of pirates captured across the Four Seas every year, the prisons of the allied nations, Navy headquarters, and branch bases were far from sufficient to hold them all.
Consequently, apart from exceptionally powerful and heinous pirates who were sent to Impel Down, the World Government had selected four special islands in the Four Seas, converting each entire island into a prison.
Chapter 83