sentences:  There are many kelongs in the Serangoon Harbour, these belong to fishermen who rear fishes and other sea animals that are sold in Singapore.These fishermen mainly use Changi Point Ferry Terminal or Lorong Halus Jetty as a drop off point to come onto mainland.The part of Serangoon Harbour off Pasir Ris Park have floating buoys to demarcate the swimming boundary of the park.