The geographical location of St. John's island

St. John's Island was a quarantine checkpoint for Asian immigrants in the early days of its opening in Singapore, and became a concentration camp and drug rehabilitation center for political prisoners in Singapore in the mid-20th century. The quarantine station and drug rehabilitation center on the island were closed in the 1970s, but the facilities of the detention center for illegal immigrants remained here. 2 1 century, St. John's Island is a holiday island in Singapore, and it is also home to the Institute of Tropical Marine Science and the Bureau of Agriculture, Food and Veterinary Medicine (the mariculture center of Ivell Singapore).