Ficus superba has never yet been found on mainland Borneo but is locally common on islands in the South China Sea and Java Sea.
The Ficus superba individuals in the photos below were photographed on the Sembilan islands in the Java Sea between South Kalimantan and the north coast of Java.
For information on how to distinguish Ficus superba from the much more common Ficus virens, see here.
Photos and information thanks to Rahim Idris.