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At the end of the 14th and beginning of the 15th century, a wall, 625 metres (2,051 ft) long, was built around the castle. Due to improvements made in firearms, additional defensive elements were added between the 16th and 17th centuries. Erik Dahlbergh designed the Vauban-type fortress with bastions and ravelins that are still largely intact.
The ecoregion is centered on the Ural mountains, a range that reaches heights of 1,895 m (6,217 ft). The western edge of the region is the Russian Plain, and the eastern edge is the beginning of the West Siberian Plain. [2]