Saint Mark is one of Dominica's 10 administrative parishes. It is bordered by St. Luke (to the north) and St. Patrick (to the east). With an area of 9.9 km² (2 mi²), it is the smallest in the island. It had a population of 1,834 people at the Population Census of 2011.
The main settlements in the parish are Soufrière and Scotts Head (near which the only tombolo in the West Indies can be found). Another village in the parish is Galion.