Quezon Province Overview Formerly known as the province of Tayabas, Quezon Province is the largest in the CALABARZON Region (Region 4-A), bordered by Aurora Province (North), Bulacan and Nueva Ecija (Northwest), Rizal and Laguna (West), Batangas (Southwest), Marinduque (South), Camarines Norte (East), and Camarines Sur (Southeast). The