Felben-Wellhausen has an area, as of 2009, of 7.38 square kilometers (2.85 sq mi).
 Of this area, 4.2 km² (1.6 sq mi) or 56.9% is used for agricultural purposes, while 1.89 km² (0.73 sq mi) or 25.6% is forested.
  Of the rest of the land, 1.01 km² (0.39 sq mi) or 13.7% is settled (buildings or roads), 0.2 km² (0.077 sq mi) or 2.7% is either rivers or lakes and 0.04 km² (9.9 acres) or 0.5% is unproductive land.

Of the built up area, industrial buildings made up 5.3% of the total area while housing and buildings made up 1.9% and transportation infrastructure made up 0.5%.
while parks, green belts and sports fields made up 5.7%.
 Out of the forested land, 24.5% of the total land area is heavily forested and 1.1% is covered with orchards or small clusters of trees.
 Of the agricultural land, 55.0% is used for growing crops, while 1.9% is used for orchards or vine crops.
 Of the water in the municipality, 0.4% is in lakes and 2.3% is in rivers and streams.

The municipality is located in the Frauenfeld district, along the Thur River.
 Until the Thur Correction project of 1880, the town was routinely flooded by the river.
 It consists of the villages of Felben and Wellhausen which merged in 1983 to form Felben-Wellhausen.
Felben-Wellhausen has an area, as of 2009, of 7.38 square kilometers (2.85 sq mi).  Of this area, 4.2 km² (1.6 sq mi) or 56.9% is used for agricultural purposes, while 1.89 km² (0.73 sq mi) or 25.6% is forested.   Of the rest of the land, 1.01 km² (0.39 sq mi) or 13.7% is settled (buildings or roads), 0.2 km² (0.077 sq mi) or 2.7% is either rivers or lakes and 0.04 km² (9.9 acres) or 0.5% is unproductive land.
Of the built up area, industrial buildings made up 5.3% of the total area while housing and buildings made up 1.9% and transportation infrastructure made up 0.5%. while parks, green belts and sports fields made up 5.7%.  Out of the forested land, 24.5% of the total land area is heavily forested and 1.1% is covered with orchards or small clusters of trees.  Of the agricultural land, 55.0% is used for growing crops, while 1.9% is used for orchards or vine crops.  Of the water in the municipality, 0.4% is in lakes and 2.3% is in rivers and streams.
The municipality is located in the Frauenfeld district, along the Thur River.  Until the Thur Correction project of 1880, the town was routinely flooded by the river.  It consists of the villages of Felben and Wellhausen which merged in 1983 to form Felben-Wellhausen.
Felben-Wellhausen