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
Hydrology of Switzerland Hydrology of Switzerland Hydrology is the science which studies the water cycle as a whole, hence the water exchanges between soil and atmosphere (precipitation and evaporation) but also between the soil and sub ground (groundwater). Switzerland has a varied and complex hydrological system. The climate gives precipitation under the form of snow and rain and is also responsible for the evaporation of water into the atmosphere. The altitude and climate allow the formation and maintenance of many glaciers that feed rivers from five major European river catchments, through which water leaves the country and joins the sea. Switzerland is sometimes