From the introduction:
This campaign is the ultimate hex crawl, taking the newly formed adventuring party by canoe from the northern reaches of Blackmoor to the “Gem of the Flanaess” - Greyhawk – via the Velverdyva River, a journey consisting of 94 hexes and 2,820 miles! The journey of a lifetime awaits your new characters in this river campaign. Organized in 15 chapters, consisting of over 500 pages, and a dozen major adventures, the ultimate goal of this campaign is very simple: Greyhawk or bust!
Get ready to return to the greatest world in the history of role playing games for some old school, classic, first edition, Advanced Dungeons & Dragons.