Montsevelier had an area of 7.79 km² (3.01 sq mi).
 Of this area, 3.91 km² (1.51 sq mi) or 50.2% is used for agricultural purposes, while 3.57 km² (1.38 sq mi) or 45.8% is forested.
  Of the rest of the land, 0.32 km² (0.12 sq mi) or 4.1% is settled (buildings or roads), 0.01 km² (2.5 acres) or 0.1% is either rivers or lakes.

Of the built up area, housing and buildings made up 2.4% and transportation infrastructure made up 0.9%.
 Out of the forested land, 43.1% of the total land area is heavily forested and 2.7% is covered with orchards or small clusters of trees.
 Of the agricultural land, 17.5% is used for growing crops and  20.5% is pastures, while 1.5% is used for orchards or vine crops and 10.7% is used for alpine pastures.
 All the water in the municipality is flowing water.

The former municipality is located in the Delemont district, in the upper most section of the Val Terbi.
Montsevelier had an area of 7.79 km² (3.01 sq mi).  Of this area, 3.91 km² (1.51 sq mi) or 50.2% is used for agricultural purposes, while 3.57 km² (1.38 sq mi) or 45.8% is forested.   Of the rest of the land, 0.32 km² (0.12 sq mi) or 4.1% is settled (buildings or roads), 0.01 km² (2.5 acres) or 0.1% is either rivers or lakes.
Of the built up area, housing and buildings made up 2.4% and transportation infrastructure made up 0.9%.  Out of the forested land, 43.1% of the total land area is heavily forested and 2.7% is covered with orchards or small clusters of trees.  Of the agricultural land, 17.5% is used for growing crops and  20.5% is pastures, while 1.5% is used for orchards or vine crops and 10.7% is used for alpine pastures.  All the water in the municipality is flowing water.
The former municipality is located in the Delemont district, in the upper most section of the Val Terbi.
Montsevelier