I find that map very difficult to read, can't identify enough on it to be useful: but the text seems to indicate that the line between central and south, west of the Crest is the Merced/ San Joaq Divide, to over near Mono Pass and Bloody Canyon/Walker Lake east of the Crest, ie the southern/southeastern boundary of Yosemite.
Last edited by saltydog; 03/25/17 02:18 PM.