 The Sierra Madre range has its southern limits at Quezon province.Ultra-prominent mountains dot the landscape, which include Mount Isarog and Mount Iriga in Camarines Sur, and Mount Bulusan in Sorsogon.The peninsula's coastline features several smaller peninsulas, gulfs and bays, which include Lamon Bay, San Miguel Bay, Lagonoy Gulf, Ragay Gulf, and Sorsogon Bay.