...Not until then did they notice that Gandalf was missing ...“Just when a wizard would have been most useful, too,” groaned Dori and Nori, who shared the hobbit’s views about regular meals, plenty and often...
The Eccleshall Ring is a 2-3 Hour walk south of Eccleshall, based on the 13 Dwarves that accompanied The Hobbit.
ASK Nori: Where's Gandalf?
Collect the numbers from each cache if you want to find Gandalf, a bonus cache also near Eccleshall. Nori's number is on the inside of the lid of the cache container.