Modalen municipality sits in the central part of Vestland county. It surrounds the innermost part of the Romarheimsfjorden (which is also called the Mofjorden) and the Modalen valley which extends eastwards from the end of the fjord. Both sides of the valley are mountainous, so the municipality is quite isolated with only two roads connecting it to the outside world. Both roads were constructed fairly recently, before that time, the municipality was only accessible by boat or crossing mountains on foot. The Modalen Tunnel was built in 1976 and it connects this valley to the Eksingedalen valley to the south. The other road was finished in 1996, and it follows the fjord heading west to Lindås.