Belmullet is a coastal Gaeltacht town with a population of 1,019 on the Mullet Peninsula in the barony of Erris, County Mayo, Ireland. It is the commercial and cultural heart of the barony of Erris, which has a population of almost 10,000. According to the 2016 census 50% of people in the town were able to speak Irish while only 4% spoke it on a daily basis outside the education system.

Blacksod Bay is a bay of the Atlantic Ocean in Erris, north County Mayo, Ireland. The 16 km (9.9 mi) long and 8 km (5.0 mi) wide bay is bounded on its western side by the Mullet Peninsula. Its eastern side includes Kiltane Parish, which extends southwards from Belmullet towards Gweesalia and Doohoma.