This map comes from this article from WBEZ, NPR in Chicago. The article is well worth reading as it describes how the arrangement seen in the map came to be. It also mentions that the US embassy, placed in Jerusalem by President Trump at the request of his billionaire donor Sheldon Adelson, is located in the UN Zone seen on the map.
For a detailed look at the occupation of the West Bank by Israel, see the excellent map produced by the Israeli NGO, B'Tselem.
