APO Reef is one of the best and famous diving site in the Philippines and most popular coral reef in the world. APO reef is the second largest coral reef area in the world. Lake Lanao  is the second largest lake in the Philippines, probably the deepest in the country and is considered one of the major tropical lakes in Southeastern Asia. The world's second deepest spot underwater  is in the Philippines. This spot, about 34,440 feet (10,497 meters) below the sea level, is known as the Philippine Deep or the Mindanao Trench. The Philippine Deep is in the floor of the Philippine Sea. The German ship Emden first plumbed the trench in 1927