- This is the largest lowland in Luzon and is located in the central part of the region.
-It is bounded by the Caraballo Mountains to the east, the Zambales Mountains to the west, the Sierra Madre Mountains to the north, and the Manila Bay to the south.
- The major rivers that drain the plain are the Pampanga River, the Agno River, and the Tarlac River.
Cagayan Valley
-This lowland is located in the northeastern part of Luzon and is the second largest in the region.
-It is bounded by the Caraballo Mountains to the west, the Sierra Madre Mountains to the east, and the Pacific Ocean to the north.
-The major river that drains the plain is the Cagayan River.
Ilocos Plain
- This lowland is located in the northwestern part of Luzon and is the third largest in the region.
-It is bounded by the Cordillera Central to the east, the Zambales Mountains to the west, and the South China Sea to the north.
-The major river that drains the plain is the Agno River.
Bicol Plain
- This lowland is located in the southeastern part of Luzon and is the fourth largest in the region.
-It is bounded by the Caraballo Mountains to the north, the Sierra Madre Mountains to the east, and the Pacific Ocean to the south.
-The major river that drains the plain is the Bicol River.
Manila Plain
- This lowland is located in the southwestern part of Luzon and is the smallest in the region.
-It is bounded by the Caraballo Mountains to the north, the Zambales Mountains to the west, and the Manila Bay to the south.
-The major river that drains the plain is the Pasig River.