Camarines Sur (Tagalog: Timog Camarines) is a province of the Philippines located in the Bicol Region in Luzon. Its capital is Pili and the province borders Camarines Norte and Quezon to the north, and Albay to the south. To the east lies the island province of Catanduanes across Maqueda Channel.
Camarines Sur is the largest among the six provinces in the Bicol Region both in terms of population and land area. Its territory includes two cities: Naga City, the lone chartered city, is the province's and the region's religious, cultural, financial, commercial, industrial, and business center, while Iriga City, a component city, is the center of the Rinconada area and Riŋkonāda Language. Lake Buhi is where the smallest commercially harvested fish can be found, the Sinarapan or tabyos (Mistichthys luzonensis).
Camarines Sur lies at the center of the Bicol Peninsula. The province is also the largest in the Bicol Region with a land area of 5,266.8 square kilometers. At the center of the province is Bicol Plain. Surrounding it are mountains, two of which are Mount Isarog and Mount Iriga. The eastern part of the province lies on the mountainous Caramoan Peninsula, which faces the island of Catanduanes to the east. The Bicol River drains the central and southern parts of the province into San Miguel Bay. Mt. Asog is surrounded by three lakes: Buhi, Bato, and Baao.