Aliwagwag%20is%20situated%20in%20the%20Eastern%20Mindanao%20Biodiversity%20Corridor%20which%20contains%20one%20of%20the%20largest%20remaining%20blocks%20of%20tropical%20lowland%20rainforest%20in%20the%20Philippines.%20It%20covers%20an%20area%20of%2010,491.33%20hectares%20(25,924.6%20acres)%20and%20a%20buffer%20zone%20of%20420.6%20hectares%20(1,039%20acres)%20in%20the%20hydrologically%20rich%20mountainous%20interior%20of%20the%20municipalities%20of%20Cateel%20and%20Boston%20in%20Davao%20Oriental%20as%20well%20as%20a%20portion%20of%20the%20municipality%20of%20Compostela%20in%20Compostela%20Valley.%20It%20is%20also%20home%20to%20the%20tallest%20trees%20in%20the%20Philippines,%20the%20Philippine%20rosewood,%20known%20locally%20as%20toog.%20In%20the%20waters%20of%20the%20upper%20Cateel%20River,%20a%20rare%20species%20of%20fish%20can%20be%20found%20called%20sawugnun%20by%20locals%20which%20is%20harvested%20as%20a%20delicacy.