The circuit begins in Partnunstafel at the foot of the Schijenflue, at the far end of the St. Antöniertal valley, a side valley of the Prättigau. Hiking past alpine pastures and over dwarf shrub heathland we soon make our way up to the emerald-green waters of the Partnunsee lake. Surrounded by the sheer limestone walls of the Sulzfluh and Schijenflue the mountain trail takes us through a stunning limestone landscape up to the Tilisunafürggli, the «green border» with Austria. Here the landscape turns into a hilly grassy high-alpine valley where alpine cattle graze in summer. After a short detour to the Tilisuna hut we continue on our way along a gentle up-and-down section, past small lakes and one or two customs huts, then over the Gruoben Pass to the highest point of our hike, the Plasseggen Pass (2354 m), which also forms the state border with Switzerland.

Dark mountain ranges of crystalline Silvretta rock on one side of the valley contrast sharply with the lighter limestone massif on the other. After passing the Plasseggen hut we find ourselves on a short and very steep section that zigzags its way downhill. The views gradually open up as we make our way through dwarf shrub heathland and across lush alpine meadows back to the Partnunstafel, where two mountain restaurants offer some welcome hospitality.