 The peninsula encloses the Manila Bay, a natural harbor considered to be one of the best natural ports in East Asia, due to its size and strategic geographical location.The Sierra Madre mountain range continues to stretch across the western section of Central Luzon, snaking southwards into the Bicol Peninsula.The northern section of Southern Luzon is dominated by the Laguna de Bay (Old Spanish, ""Lake of Bay town""), the largest lake in the country.