The Agusan Marsh is one of the biggest wetlands in the Philippines .
These caves have limestone formations and naturally carved stalagmites , stalactites and columns. The Agusan Marsh in Agusan del Sur is one of the biggest wetlands in the country and is host to diverse species of birds. Festivals include the Naliyagan Festival of Agusan del Sur , Kahimunan , Balangay , Kaliguan Festival of Cagwait in Surigao del Sur , Lisagan and the most famous in the region , the Bonok-Bonok Maradjaw Karadjaw festivals , in honor of its Patron Saint San Nicolas de Tolentino .
Caraga