What is "tieralplistock"

The Tieralplistock (3,383 m) is a mountain of the Urner Alps, located on the border between the Swiss cantons of Bern and Valais. It lies between the Trift Glacier and the Rhone Glacier, just east of the lake of Gelmer.

Between the Diechterhorn and the Tieralplistock is a slightly higher unnamed summit (3,388 m).