Link: Interactive Map of the Middle Passage

Some background to the Zong story in A CRACK IN THE SEA: To get some sense of how active the Middle Passage was—and how massive the slave trade—take a look at this interactive video. In about two minutes, it will show you the ship routes for over 200 years of slave trade; you can click on any dot to see more information about that vessel and the people on board.

http://www.slate.com/articles/life/the_history_of_american_slavery/2015/06/animated_interactive_of_the_history_of_the_atlantic_slave_trade.html