Fahrwangen lies on the southern edge of the district of Lenzburg, in the Seetal valley east of the Hallwilersee.
It borders the canton of Luzern.
It is located at the western foot of the Lindenberg mountain in a depression above the Hallwilersee.
 It consists of the irregular, unplanned, and quite closely packed village of Fahrwangen, built around a central square.

Fahrwangen has an area, as of 2009, of 3.99 square kilometers (1.54 sq mi).
 Of this area, 2.26 km² (0.87 sq mi) or 56.6% is used for agricultural purposes, while 0.99 km² (0.38 sq mi) or 24.8% is forested.
  Of the rest of the land, 0.69 km² (0.27 sq mi) or 17.3% is settled (buildings or roads), 0.01 km² (2.5 acres) or 0.3% is either rivers or lakes and 0.01 km² (2.5 acres) or 0.3% is unproductive land.

Of the built up area, housing and buildings made up 11.0% and transportation infrastructure made up 5.0%.
 Out of the forested land, all of the forested land area is covered with heavy forests.
 Of the agricultural land, 42.4% is used for growing crops and 12.8% is pastures, while 1.5% is used for orchards or vine crops.
 All the water in the municipality is in rivers and streams.
Fahrwangen lies on the southern edge of the district of Lenzburg, in the Seetal valley east of the Hallwilersee. It borders the canton of Luzern. It is located at the western foot of the Lindenberg mountain in a depression above the Hallwilersee.  It consists of the irregular, unplanned, and quite closely packed village of Fahrwangen, built around a central square.
Fahrwangen has an area, as of 2009, of 3.99 square kilometers (1.54 sq mi).  Of this area, 2.26 km² (0.87 sq mi) or 56.6% is used for agricultural purposes, while 0.99 km² (0.38 sq mi) or 24.8% is forested.   Of the rest of the land, 0.69 km² (0.27 sq mi) or 17.3% is settled (buildings or roads), 0.01 km² (2.5 acres) or 0.3% is either rivers or lakes and 0.01 km² (2.5 acres) or 0.3% is unproductive land.
Of the built up area, housing and buildings made up 11.0% and transportation infrastructure made up 5.0%.  Out of the forested land, all of the forested land area is covered with heavy forests.  Of the agricultural land, 42.4% is used for growing crops and 12.8% is pastures, while 1.5% is used for orchards or vine crops.  All the water in the municipality is in rivers and streams.
Fahrwangen