Mykines is the westernmost of the 18 main islands of the Faroese Archipelago.

It lies west of 7.5 degrees W, effectively putting it in the UTC-1 region. However, Mykines uses Greenwich Mean Time like the rest of the Faroes. The only settlement on the island is also called Mykines.

On the northern side of the island is the valley of Korkadalur, where there are great columns of basalt, called the Stone-wood. To the west of Mykines is the 1 km long islet Mykinesholmur, with several sea stacks clustered at its western end, where a lighthouse was built in 1909. A 40m-long footbridge connects its eastern end with Mykines.

Mykines belongs to the oldest part of the Faroe Islands and was formed about 60 million years ago. The Faroese basalt is divided into three phases of eruption: the lower and oldest, the middle, and the upper and youngest; the lowest formed by the eruption of low-viscosity lava through long fissures, forming flat volcanoes. In the sound between Mykines and Mykinesholmur, Holmgjogv, one can see one of the most abundant of such flows on the Faroes, with a depth of about 50 m. The interspersed layers of softer volcanic tuff between the layers of basalt are differentially eroded, so forming, especially on the steep northern side of the islet, some of the richest bird cliffs in the world. The highest peak on the island is Knukur at 560 metres above sea level.