tĕrsā´re) , island (1991 pop. 59,248), 153 sq mi (396 sq km), in the N Atlantic. Terceira lies in the center of the Azores and is beside Sao Miguel the second hauptinsel. It has a surface of 382 qkm. Capital Angra DO Heroismo is created in 16th Century, probably the most beautiful city of the Azores.

• The municipality Agualva has its name the clarity of the many rivers in the north of Terceira
• Majority of the population today still lives on the agriculture and cattle breeding.
• The name Terceira Island owes to the fact that it was discovered as the third island of the archipelago.
• In addition, it is the third biggest one of the Azores and has been independent since the 16th century