Siebenzwingstein, Boundary marker in Aargau, Switzerland

Siebenzwingstein is a boundary marker made of interlocked granite blocks positioned at 607 meters elevation where the municipalities of Gränichen, Teufenthal, and Seon meet. The site also marks the convergence of the Lenzburg, Kulm, and Aarau district boundaries.

The name records seven Zwinge, judicial districts each grouping several villages under a common court, that once met here: Teufenthal, Dürrenäsch, Retterswil, Seon, Gränichen, Liebegg and Trostburg. Retterswil was absorbed into Seon in 1898, Liebegg passed to Gränichen and Trostburg to Teufenthal, and Dürrenäsch no longer reaches the stone. Why these borders met at an indistinct spot in the Liebeggerwald is unexplained.

The name references the seven historic judicial districts that once converged here and shaped local governance for centuries. Today, the stone structure serves as a reminder of the intricate territorial divisions that defined this region.

The site is accessible through marked hiking trails in a rural setting with clear signage. The location sits on open ground offering views of the surrounding countryside.

The name refers to seven Zwinge, judicial districts that once met here; today only three municipalities do. Dürrenäsch no longer reaches the stone for unexplained reasons, and Liebegg and Trostburg were absorbed into Gränichen and Teufenthal. Retterswil was merged into Seon in 1898. Why all these borders met at a hard-to-define point in the Liebeggerwald is still unexplained.