via the Australian National University, 13 December 2017:
A tiny Indonesian island, previously unexplored by archaeologists, has been found to be unusually rich in ancient cave paintings following a study by researchers from The Australian National University (ANU). The team uncovered a total of 28 rock art sites dating from at least 2,500 years ago on the island of Kisar which measures just 81 square kilometres and lies north of Timor-Leste.
Source: Indonesian island found to be unusually rich in cave paintings