Cantons of Switzerland the canton of Schwyz. Six of the 26 cantons are traditionally, but no longer officially, called "half-cantons" (, , , ). In two instances (Basel and Appenzell) this was a consequence of a historic division, whilst in the case of Unterwalden a historic mutual association, resulting in three pairs of half-cantons. The other 20 cantons were — and in some instances still are — though only in a context where it is needed to distinguish them from any half-cantons, typically termed "full" cantons in English. The historic half-cantons, and their pairings, are still recognizable in the first article of the
Cantons of Switzerland that remains in popular use, the 1999 revision and official terminology since then use the appellation "cantons with half of a cantonal vote". The reasons for the existence of the three pairs of half-cantons are varied: With their original circumstances of partition now a historical matter, the half-cantons are since 1848 equal to the other cantons in all but two respects: Between 1831 and 1833 the canton of Schwyz divided into half-cantons: (Inner) Schwyz and the break-away Outer Schwyz; in this instance the half-cantons were forced by the Confederation to settle their disputes and re-unite. In the 20th century, some