Safnern has an area of 5.62 km² (2.17 sq mi).
 As of 2012, a total of 2.45 km² (0.95 sq mi) or 43.6% is used for agricultural purposes, while 1.9 km² (0.73 sq mi) or 33.8% is forested.
  Of the rest of the land, 1 km² (0.39 sq mi) or 17.8% is settled (buildings or roads), 0.17 km² (0.066 sq mi) or 3.0% is either rivers or lakes and 0.11 km² (27 acres) or 2.0% is unproductive land.

During the same year, industrial buildings made up 2.0% of the total area while housing and buildings made up 8.4% and transportation infrastructure made up 3.4%.
 Power and water infrastructure as well as other special developed areas made up 3.4% of the area  Out of the forested land, all of the forested land area is covered with heavy forests.
 Of the agricultural land, 35.8% is used for growing crops and  6.4% is pastures, while 1.4% is used for orchards or vine crops.
 Of the water in the municipality, 2.1% is in lakes and 0.9% is in rivers and streams.

Safnern lies in the Bernese Seeland at the foot of the Bütten Mountains.
 It is also along the Nidau-Büren channel as well as the old river bed of the Zihl and Aare Rivers.

On 31 December 2009 Amtsbezirk Nidau, the municipality's former district, was dissolved.
 On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Biel/Bienne.
Safnern has an area of 5.62 km² (2.17 sq mi).  As of 2012, a total of 2.45 km² (0.95 sq mi) or 43.6% is used for agricultural purposes, while 1.9 km² (0.73 sq mi) or 33.8% is forested.   Of the rest of the land, 1 km² (0.39 sq mi) or 17.8% is settled (buildings or roads), 0.17 km² (0.066 sq mi) or 3.0% is either rivers or lakes and 0.11 km² (27 acres) or 2.0% is unproductive land.
During the same year, industrial buildings made up 2.0% of the total area while housing and buildings made up 8.4% and transportation infrastructure made up 3.4%.  Power and water infrastructure as well as other special developed areas made up 3.4% of the area  Out of the forested land, all of the forested land area is covered with heavy forests.  Of the agricultural land, 35.8% is used for growing crops and  6.4% is pastures, while 1.4% is used for orchards or vine crops.  Of the water in the municipality, 2.1% is in lakes and 0.9% is in rivers and streams.
Safnern lies in the Bernese Seeland at the foot of the Bütten Mountains.  It is also along the Nidau-Büren channel as well as the old river bed of the Zihl and Aare Rivers.
On 31 December 2009 Amtsbezirk Nidau, the municipality's former district, was dissolved.  On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Biel/Bienne.
Safnern