May 9 2023 Primer: Why we are in Calbayog We take a quick look at the city of Calbayog, one of 8 places where we have dedicated our work and care to Filipino children and families. A map of Samar with the City of Calbayog highlighted. Map template from Vemaps.com. The city of Calbayog is located in the western part of the island of Samar and is the sixth largest city in the Philippines by land area. The city stretches along the coast, and is divided into three major districts: Calbayog, Tinambacan, Oquendo.