Legends of the Nentir Vale
The Moon Hills are the hills surrounding Fallcrest that help to protect it by making it difficult for any sizeable group or army to advance without breaking up. Without the Moon Hills to help keep them safe from intruders, Fallcrest would not have lasted nearly as long as it has, and would have surely been obliterated during the Bloodspear War. The first group of Bloodspear orcs to arrive overcame the soldiers and militia and ransacked Fallcrest rather than completely destroying it. The orcs left many buildings burning and returned to the main orc army telling them the mission was complete and that Fallcrest was completely destroyed. The orc commander, seeing the smoke from the town, turned the rest of his army to attack other human settlements.
The residents of Fallcrest respect these hills and small fertile valleys and owe much of their prosperity to them. The Moon Hills over the centuries have been lightly settled by humans from many empires and there are ruins of various ages dotted all over it.
The area closest to the town is well patrolled by the Fallcrest Guard, but beyond that goblins and human bandits are known to exist.