They are included between the valleys of the Serchio and Magra rivers, and, to the northwest, the Garfagnana and Lunigiana, with a total length of approximately 55 kilometres (34 mi).

[1] The name derives from the Apuani Ligures tribe that lived there in ancient times.

Due to its extraction height environmental impact, the No Cav movement strongly opposes this activity.

[citation needed] The chain formed out of sea sediments in the middle Triassic period, somewhat earlier than the rest of the Apennines, and on a rather different geological structure.

[1] Erosion carved much of the remaining sedimentary rocks into a jagged karst topography.