Wikipedia
Ilocandia
Ilocandia is the term given to the traditional homeland of the Ilocano people.
From the original western strip of Northern Luzon (now known as the Region 1 or Ilocos Region), Ilocandia has spread throughout the Cagayan Valley, Cordillera Administrative Region, and some parts of Central Luzon.
Although there are also a large number of Ilocanos in other parts of the Philippines like, Palawan and Mindanao, these are not considered to be a part of Ilocandia, as they are not part of the traditional Ilocano homeland.