Reference map.
I have the amazon store highlighted and you can see the river Drake came from. he floated down from an island in Theodore Roosevelt Lake. if you zoom out, its the lake on the right. the island he is from is that larger one in the mid left of the satellite image.
[url=https://www.google.com/maps/place/4750+W+Mohave+St,+Phoenix,+AZ+85043/@33.4151884,-112.1565574,5632m/data=!3m1!1e3!4m2!3m1!1s0x872b1418ce154f75:0xdd630a8d7c53c2cf] google map of the area.[/url]