Alcains is a Portuguese civil parish in the municipality of Castelo Branco. The population in 2021 was 4615, in an area of 36.94 km². Alcains is located within the urban agglomeration of Castelo Branco- Covilhã- Guarda, situated 12 km to the north of Castelo Branco, 230 km to the northeast of Lisbon and 280 km southeast from Oporto, while 70 km to the west of the Portuguese-Spanish border and 380 km from Madrid).