|• Mayor (2008–2014)||Marcel Lavoix|
|Area1||15.54 km2 (6.00 sq mi)|
|• Density||19/km2 (50/sq mi)|
|INSEE/Postal code||24458 / 24300|
|Elevation||127–302 m (417–991 ft)
(avg. 135 m or 443 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.2 Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once.
Saint-Martin-le-Pin is situated along the D 94 about 5 kilometers northwest of Nontron. The boundary with Nontron to the southeast is the Ruisseau des Vergnes, a southwest-flowing right tributary of the Bandiat. The commune's territory reaches the Bandiat river itself in the southwest, forming a natural boundary with the neighbouring communes Saint-Martial-de-Valette in the south and Lussas-et-Nontronneau in the southwest. The commune's boundary to Javerlhac-et-la-Chapelle-Saint-Robert in the northwest and Le Bourdeix farther north is the Doue river, also a smaller right tributary of the Bandiat.
Besides the main village there are lots of little hamlets and single farms for example Ars, Blanchetière, Chantemerle, Chez Thomas, Crachat, Jourdonnières, La Borderie, La Combe au Cros, La Tuilière, Le Moulin de chez Jouanaud, Les Cazes, Lespinasse, Loradour, Mérignac, Pas Brouillet, Ribeyrolle, Talivaud, and Tranchecouyère.
The commune's territory is underlain in its totality by Variscan basement rocks (Piégut-Pluviers Granodiorite). Transgressing the basement from the West are liassic sediments belonging to the Aquitanian Basin. The base conglomerate can be seen near La Chapoulie. Stratigraphically higher follow arkoses, dolostones and limestones. A NW-SE striking fault zone originating in Nontron traverses the territory and raises the Northeastern basement block. Movements along this fault zone must have been going on well into the Pleistocene, because one can observe stream rejuvenation along some of the southwestward-draining creeks. This fault zone is strongly mineralised in mainly baryte, but there is also galena, sphalerite, pyrite and the rather rare cadmium mineral greenockite. This fault zone has been mined in the past, the shaft of the mine de la Mairie  still can be seen in the village. Associated with the ores is an intensive recrystallization and silicification of the country rocks along the fault line. Between 1825 and 1850 manganese was mined near Talivaud in the contact region between the arkoses and the overlying Sidérolithique, iron-rich Tertiary sediments.
The limestones sometimes develop karst phenomena like caves (near Blanchetière).
The floodplain of the Bandiat is infilled by alluvial Pleistocene sands with occasional intercalated layers of polished quartz pebbles.
The population has suffered a serious set-back after 1968, but has stabilised since 1975.
The Bandiat river downstream from the bridge near Ars
- Occitan names of the communes in the Périgord, website of the Conseil général de la Dordogne
- P. Didier. Les espèces minerales du Limousin.
- Saint-Martin-le-Pin on mindat.org
- Church of Saint-Martin-le-Pin amongst the Mérimée data of the French Ministry of Education
- Romanesque church of Saint-Martin-le-Pin on route-romane.net
- Cassini map on Géoportail
|Wikimedia Commons has media related to Saint-Martin-le-Pin.|