A large part of Viljandi County is covered by the low Sakala Upland (highest point 147 m), only a small part of the upland in the southeast and the southwest extends outside the county borders. The parallel name
Sakala is also used for the county. Viljandi County also includes most of the Võrtsjärv Lowland (in the east) and in the north, a small part of the Central Estonian Plateau extends into the area of Viljandi County.
Soomaa National Park is located partially within Viljandi County,
Estonia;
Soomaa mans 'land of
bogs'. It protects 390 km2 and is a
Ramsar site of protected
wetlands. The park was created in 1993. The county includes also
Loodi Landscape Conservation Area and several other protected areas. == Municipalities ==