The area mainly underlain with hornblende-biotite gneiss of the eastern Vijayan series . The low country dry zone climate prevails in the area . The area have an average relative humidity of 80 % . The national park contains five shallow , brackish lagoons with salt pans in three . They are Bundala lagoon of , Embilikala Lagoon of , Malala Lagoon of , Koholankala lagoon of , and Mahalewaya of . The Koholankala and Mahalewaya are almost totally developed for salt production . The climatic conditions are tropical monsoonal , with a mean annual temperature of . Annual rainfall ranges from , with dry period persists from May to September.The elevation of the park ranges from sea level to . The park was affected by 2004 Indian Ocean tsunami . Due to protection from sand dunes the park received very little damage
2004 Indian Ocean tsunami
2004 Indian Ocean earthquake and tsunami
Bundala National Park