Inhabitants of Séglien are called in French Ségliennais.

Historical population

Year Pop. ±% p.a. 1793 1,976 —     1800 1,953 −0.17% 1806 2,004 +0.43% 1821 1,876 −0.44% 1831 2,054 +0.91% 1836 2,122 +0.65% 1841 2,071 −0.49% 1846 2,230 +1.49% 1851 2,175 −0.50% 1856 2,010 −1.57% 1861 1,957 −0.53% 1866 1,980 +0.23% 1872 1,867 −0.97% 1876 1,973 +1.39% 1881 1,951 −0.22% 1886 2,014 +0.64% 1891 1,978 −0.36% 1896 2,005 +0.27%	Year Pop. ±% p.a. 1901 2,077 +0.71% 1906 2,103 +0.25% 1911 2,090 −0.12% 1921 1,981 −0.53% 1926 1,862 −1.23% 1931 1,861 −0.01% 1936 1,791 −0.76% 1946 1,760 −0.17% 1954 1,413 −2.71% 1962 1,299 −1.05% 1968 1,115 −2.51% 1975 902 −2.98% 1982 804 −1.63% 1990 724 −1.30% 1999 709 −0.23% 2009 720 +0.15% 2014 696 −0.68% 2020 645 −1.26%
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Source: EHESS and INSEE (1968-2020)

Séglien is border by Silfiac to the north, by Langoëlan to the west, by Locmalo and Guern to the south and by Malguénac and Cléguérec to the east. Historically, Séglien belongs to Vannetais. The river Sarre, a tributary of the river Blavet, flows through the commune.

From the Roman period there remains a section of the Roman road connecting Castennec to Carhaix, passing through Mané-Guégan, Quénécalec and Resterhierven. On this road, not far from Saint-Germain, there is a mutilated cylindrical stone, which could have been a milestone.

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  Mutilated cylindrical stone on the ancient Roman road, maybe ancient milestone.
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  Chapel Saint Germain.
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  Bread oven in Saint Germain.
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  Chapel of Locmaria.
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  Chapel Saint John.

• Communes of the Morbihan department

Wikimedia Commons has media related to Séglien.

• Official website (in French)
• Base Mérimée: Search for heritage in the commune, Ministère français de la Culture. (in French)
• Mayors of Morbihan Association (in French)

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