The secret entrance to the Lonely Mountin. That is explained in the chapter "An Unexpected Party". Gandalf says, "There is one point that you haven't noticed and that is the secret entrance. You see that rune on the West side, and the hand pointing to it from the other runes? That marks a hidden passage to the Lower Halls."
The runes say "Five feet high the door and three may walk abreast."
Chat with our AI personalities
"There is one point that you haven't noticed," said the wizard, "and that is the secret entrance. You see that rune on the West side, and the hand pointing to it from the other runes? That marks a hidden passage to the Lower Halls." The Hobbit JRR Tolkien
The River "Running" ~ look to the link below to a map .
There were many things written on the map, but one of the most important things was, "Stand by the grey stone when the thrush knocks, and the setting sun with the last light will shine on Durin's Day will shine upon the key-hole."
The moon letters brought out additional information. Elrond found them while looking at the map with Gandalf and Thorin one evening. They provided information on the secret passage.
The book by J.J.R. Tolken shows Bilbo and Thorin and Co. using a key, Bilbo's sword, Sting, and, of course, the ring. One other thing that is sort-of apart from the map is the fact that the all-important moon-letters, which were found by Elrond the elf.