they already tell you what world you're in at the top of the browser screen. 1= arendyll, 2=winyandor, 3=felyndral, 4=khelonaar, 5=elcysandir, 6=sinya arda, 7=ceravyn, and 8=harandar. there's no need to memorize the order of the worlds as they are in the same order every time you log in.