an almost continuous dip consisting of the Venoge and the Orbe valleys which are separated by the Mormont hill, the main watershed between Rhône and Rhine, at only 500 m AMSL. The Seeland ('lake land'), characterized by the Murten, Neuchâtel and Biel lakes, represents the biggest plain of the Swiss Plateau, though it is also interrupted by isolated molasse ranges. In the east, it is neighboured by various hill countries the height of which decreases to the north. Another major plain is the Wasseramt where the Emme runs. In a broad valley alongside the Jura, the Aare collects all the rivers that come down from the Alps. The central Swiss Plateau is characterised by a number of ranges and broad valleys, some of them with lakes, that run northwest. The last of them is the Albis range, which together with the Heitersberg range forms a bar from the Alps to the Jura that the major transportations bypass only in a few places, mostly in tunnels. The eastern Swiss Plateau is structured by the valleys of the Limmat (including Lake Zurich), the Glatt, the Töss, the Murg, the Thur, and the Sitter. Between them there are hill countries, in the canton of Thurgau also the broad molasse ranges of Seerücken (lit.: 'back of the lake') and Ottenberg north of the Thur, and the hilly ranges between the Thur and the Murg. This area is colloquially also known as Mostindien (lit.: 'Cider India'). Two hill countries get out of line with the mentioned landscapes: The Napf region (with 1408 me AMSL the highest point of the Swiss Plateau) and the Töss region (up to 1300 meters AMSL), both of them the remains of Tertiary conglomerate sediment fans. Since they were not glaciated, they have only been eroded by water, resulting in a dense net of deep, narrow valleys. Climate and vegetation The Swiss Plateau is situated within a transition zone between humid oceanic climate and continental temperate climate. The predominant wind comes from the west. In the lower plateau, the mean annual temperature is about 9 – 10 °C. In January, the Lake Geneva region and the watersides of lake Neuchâtel and Lake Biel have the highest mean temperature of about +1 °C. At the same height as AMSL, the temperature is decreasing towards the east. In the Lake Constance region, the mean temperature of the coldest month is -1 °C. In