evidence: The border dispute between Indonesia and Malaysia stems from conflicting claims over the Ambalat block in the Sulawesi Sea rich in oil and gas resources. Starting in 1969 with an agreement, tensions escalated in 1979 when Malaysia claimed Ambalat in its territory. The dispute intensified further in 2005 when Malaysia granted oil concessions in Ambalat, sparking protests from Indonesia. The unresolved conflict raises concerns for the future, with historical colonial boundaries contributing to the ongoing disagreement, notably seen in conflicts over islands like Sipadan and Ligitan near East Kalimantan. [...] The border dispute between Indonesia and Malaysia originated from overlapping claims over the control of the Sulawesi Sea or the Makassar Strait known as Ambalat block, rich in oil and gas resources. The dispute began in 1969 when Indonesia and Malaysia signed an agreement regarding the ownership of the Ambalat block but escalated in 1979 when Malaysia released a new map including Ambalat in its territory, leading to various boundary violations since then. [...] A: The Ambalat block is an area in the Sulawesi Sea or the Makassar Strait rich in oil and gas resources, over which Indonesia and Malaysia have overlapping claims leading to a long-standing border dispute.