"The Republic of Cape Verde is a republic located on an archipelago in the North Atlantic Ocean, off the western coast of Africa. The previously uninhabited islands were discovered and colonized by the Portuguese in the fifteenth century." - in wikipedia.
This card shows 4 of the 10 islands of the archipelago: São Vicente, Fogo; Sal and Maio. The other 6 are: Santo Antão; Santiago; Santa Luzia; São Nicolau; Boavista and Brava.