Both islands, in Songkhla Lake, can be reached by leaving from Tambon Lam Pam pier (25 kilometres) or Pak Phayun pier (10 kilometres). The travelling time is about 1 hour. The islands are home of flocks of sea swallows, so many that they are called Ko Rang Nok (birds nest island). Concessions are given out for the collection of the nests for sale. The natural beauty of the islands is one of the finest in Phatthalung. King Rama V once visited here and left his initials on a cliff. Nearby is a monument of him. As Ko Si and Ko Ha are concession areas of the private sector, permission must first be obtained in Pak Phayun district.