There also exist other schemes for joining the Danube with the rivers Neckar and Theiss, and also for connecting the Oder Canal with the Vistula and the Dniester.
The average elevation above the sea-level is 1640 ft.; the lowest point is at Bottingen (410 ft.), where the Neckar quits the country; the highest is the Katzenkopf (3775 ft.), on the Hornisgrinde, on the western border.
The principal river is the Neckar, which flows northward for 186 m.
The population of the four departments (Kreise) into which the kingdom is divided is shown below: - The population is particularly dense in the Neckar valley from Esslingen northward.
Protestants largely preponderate in the Neckar district, Roman Catholics in that of the Danube.