Camarines Sur is the largest among the six provinces in the Bicol Region both by population and land area. Its territory includes two cities: Naga, the lone chartered city, as the province's religious, cultural, financial, commercial, industrial and business center; and Iriga, a component city, as the center of the Rinconada area and Riŋkonāda Language. Within the province lies Lake Buhi, where the smallest commercially harvested fish, the Sinarapan ("Mistichthys luzonensis"), can be found. The province is also home to the critically endangered Isarog Agta language, one of the three critically endangered languages in the Philippines according to UNESCO.