The oldest known paintings are approximately 40,000 years old, found in both the Franco-Cantabrian region in western Europe, and in the caves in the district of Maros (Sulawesi, Indonesia). Cave paintings were then found in Kalimantan, Indonesia in the Lubang Jeriji Saléh cave believed to be 40,000 - 52,000 years old. More recently, in 2021, cave art of a pig found in an Indonesian island, and dated to over 45,500 years, has been reported.[3][4] However, the earliest evidence of the act of painting has been discovered in two rock-shelters in Arnhem Land, in northern Australia. In the lowest layer of material at these sites, there are used pieces of ochre estimated to be 60,000 years old.