evidence: The Ambalat Block is a sea block covering an area of 15,235 square kilometres. It is located in the Sulawesi Sea or Makassar Strait and borders Malaysian waters. [...] The border issue in Ambalat arose because of the overlapping territorial waters of the EEZ and the continental shelf between the two countries, whose measurement refers to the 1982 UN Convention on the Law of the Sea (UNCLOS). [...] The dispute between the two countries in the Ambalat Block heated up in 1979 when Malaysia violated the Continental Shelf Boundary agreement of October 27, 1969. Under that agreement, the two countries had agreed that the Ambalat Block was a part of Indonesian territory. — Bernama-Antara