There are two locations called Isabela in the Philippines.
Isabela (Province) is a province in the Luzon area of the Philippines, located in the Cagayan Valley region. The capital of Isabela, province is Ilagan.
Isabela (City) is the capital city of the province of Basilan, Mindanao, Philippines. The city is in the Zamboanga Peninsula region, and is locally referred to as “Isabela de Basilan”