Bayerischer Plöckenstein, Mountain summit at Czech-German-Austrian border intersection.

Bayerischer Plöckenstein is a 1365 m granite summit on the German-Czech border, about 700 m west of the three-country point with Austria. Its Czech name is Trojmezná hora. Just below the top, a protected block field of granite boulders larger than those on the Lusen covers a slope, and rock outcrops stand on the summit itself.

The summit lies on the German-Czech border about 700 m west of the Dreiländereck, the tripoint where Germany, Czechia and Austria meet at 1321 m. The Czech side falls within the first zone of Šumava National Park and the Trojmezná hora nature monument, established to protect the highest parts of the Czech Šumava, including Plechý (1378 m) and Třístoličník (1302 m).

The Czech name Trojmezná refers to the Trojmezí, the saddle at 1324 m about 700 m east of the summit where the borders of Czechia, Germany and Austria meet, one of the best-known tripoints in the country. The German name Bayerischer Plöckenstein is shared with the hamlet Pleckenstein in the Neureichenau municipality on the Bavarian side.

The summit is reached on the red-marked trail no. 0148, the Šumava long-distance hiking route, between Třístoličník and Plechý; the highest rock lies about 700 m before the Trojmezí junction. The peak sits in zone I of Šumava National Park and in the Trojmezná hora nature monument, so stay on the path.

Just below the summit lies a protected block field, the Steinernes Meer, whose granite boulders are larger than those on the Lusen. Unlike the Lusen's summit blocks, this field lies on a slope. The summit rocks themselves resemble those of the nearby Dreisesselberg.