Turbenthal has an area of 25.2 km² (9.7 sq mi).
 Of this area, 34.7% is used for agricultural purposes, while 57.6% is forested.
 Of the rest of the land, 7.1% is settled (buildings or roads) and the remainder (0.6%) is non-productive (rivers, glaciers or mountains).
 In 1996 housing and buildings made up 4.3% of the total area, while transportation infrastructure made up the rest (2.8%).
 Of the total unproductive area, water (streams and lakes) made up 0.3% of the area.
 As of 2007, 4.8% of the total municipal area was undergoing some type of construction.

Turbenthal is situated in the upper Töss Valley.
Turbenthal has an area of 25.2 km² (9.7 sq mi).  Of this area, 34.7% is used for agricultural purposes, while 57.6% is forested.  Of the rest of the land, 7.1% is settled (buildings or roads) and the remainder (0.6%) is non-productive (rivers, glaciers or mountains).  In 1996 housing and buildings made up 4.3% of the total area, while transportation infrastructure made up the rest (2.8%).  Of the total unproductive area, water (streams and lakes) made up 0.3% of the area.  As of 2007, 4.8% of the total municipal area was undergoing some type of construction.
Turbenthal is situated in the upper Töss Valley.
Turbenthal