When the project began, Gal Oya was rich in wildlife, particularly elephants, which thrived in the untouched forests. Established in 1954, Gal Oya National Park now protects this biodiversity, spanning 25,900 hectares with 32 mammal species, including leopards and deer. The park’s unique feature is watching elephants swim across the reservoir, a sight best seen from March to July during boat safaris. Birdwatching is also popular, with species like ibises and eagles visible from December to April.