Rook shed early this morning while I was sleeping, but my mom was up watched, she said that after the shed she then DOVE into her water, not slid in, but climbed onto the edge, raised herself up and threw her entire body into the water at once lol I wish I had seen that, I didnt even know a snake could dive like that lol, I had to ask my mom how on earth she pulled of diving into her little water dish . anyway we havent done an official measurement, but unofficial is 13 1/2 inches