Flags and arms of cantons of Switzerland there is overlap; Unterwalden and Solothurn share the same colours, as do Basel and Appenzell, and with the accession of the modern cantons, Valais and Basel-City, and St. Gallen and Thurgau. Of the 26 cantons since 1999 (22 cantons in 1848, accession of Jura in 1979, three half-cantons designated "canton" in 1999): Distinctively, Swiss cantons use square flags. Historically, the number of cantons was: Nidwalden and Obwalden form traditional subdivisions of Unterwalden. Basel-Stadt and Basel-Landschaft, as well as Appenzell Inner- and Ausserrhoden, are half cantons, resulting from the division of Basel and Appenzell, respectively. The Swiss Federal Constitution of 1999
Cantons of Switzerland one federal public holiday (1 August); public holidays otherwise vary from canton to canton. The cantons are listed in their order of precedence given in the federal constitution. This reflects the historical order of precedence of the Eight Cantons in the 15th century, followed by the remaining cantons in the order of their historical accession to the confederacy. The two-letter abbreviations for Swiss cantons are widely used, e.g. on car license plates. They are also used in the with the prefix "CH-" ("Confœderatio Helvetica"—Helvetian Confederation—"Helvetia" having been the ancient Roman name of the region). "CH-SZ", for example, is used for