The Bastberg (French: Mont Saint-Sébastien, Alsatian: Bàschtbärri), also called Petit-Bastberg, is a summit located near the Northern Vosges Regional Nature Park, in the commune of Bouxwiller.

Not far away, between the Bastberg and Bouxwiller, is the hill of Galgenberg (French: Mont de la Potence).

Since 1 December 1989, part of the site has become a voluntary protected nature reserve covering 6.45 hectares.

This hill has been the privileged place for astronomical observations for many years, mainly in the summer period (July - August), for the "Ciel d'Alsace" (transl.

[8][9] These demonstrations were made by the Némésis club of Saverne in partnership with other clubs (Artémis of Strasbourg, Astro Junior of Hœnheim) and associations, for many years before the year 2000; as with the 1999 solar eclipse which was almost completely unobserved, the sky covered with rain clouds.