Mjóifjörður fjord is 18 km long anb 2 km wide.
The small friendly village in Mjóifjörður is called Brekkuþorp. A road exits over Mjóafjarðarheiði heath and Slenjudalur valley to Fljósdalshérað.
There are hiking trails from Mjóifjörður to both of the next fjords, Seyðisfjörður and Norðfjörður.
Dalatangi is the outermost point between Mjóifjörður and Seyðisfjörður fjords. There is a farm there, along with a lighthouse first built in 1895.