The
Urnerboden is a village in the high valley of
Urner Boden, and also an alp and a small high Alpine permanent settlement in the Swiss
Canton of Uri 
. At 8 kilometres (5.0 mi) in length, it is believed to be the largest alp in
Switzerland 
. It forms a disconnected part of the municipality of
Spiringen 
, separated from the rump of that municipality by some 8 kilometres (5.0 mi) of the municipality of
Unterschächen 
and by the
Klausen Pass 
.
The Urner Boden is traversed by the eastern approach road to the Klausen Pass to the west, from the village of Linthal in the
Canton of Glarus 
. The Klausen Pass provides the only direct connection to the rest of the municipality of Spiringen and canton of Uri that lie to the west of the pass. The pass road is normally closed between October and May, and during this period the Urner Boden is only accessible from the east via Linthal, involving a road journey between the two halves of the municipality of some 126 kilometres (78 mi).