Ambalat
| Ambalat | |
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 Ambalat
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| Coordinates: 3°47′50″N 118°51′15″E / 3.79722°N 118.85417°ECoordinates: 3°47′50″N 118°51′15″E / 3.79722°N 118.85417°E |
Ambalat is a sea block in the Celebes sea located off the east coast of Borneo. It lies to the east of the Indonesian province of North Kalimantan and to the south-east of the Malaysian state of Sabah, and it is the subject of a territorial dispute between the two nations. Malaysia refers to part of the Ambalat block as Block ND6 (formerly Block Y) and part of East Ambalat Block as Block ND7 (formerly Block Z). The deep sea blocks contain an estimated 62,000,000 barrels (9,900,000 m3) of oil and 348 million cubic meters of natural gas. Other estimates place it substantially higher: 764,000,000 barrels (121,500,000 m3) of oil and 3.96 × 1010 cubic meters (1.4 trillion cubic feet) of gas, in only one of nine points in Ambalat.
The dispute over the Ambalat stretch of the Celebes Sea began with the publication of a map produced by Malaysia in 1979 showing its territorial waters and continental shelf. The map drew Malaysia's maritime boundary running in a southeast direction in the Celebes Sea from the eastmost point of the Indonesia-Malaysia land border on the eastern shore of Sebatik island, thus including the Ambalat blocks, or at least a large portion of it, within Malaysian territorial waters. Indonesia has, like the other neighbours of Malaysia, objected to the map.
Indonesia had since 1959 claimed the islands of Sipadan and Ligitan, which in 1979 Malaysia included to be its archipelagic basepoints and again in June 2002. This effectively put the entire Ambalat area within its internal waters. During the International Court of Justice (ICJ) case over the sovereignty of Sipadan and Ligitan islands, Indonesia argued from the perspective of historic bi-lateral Agreements between Britain and the Netherlands over the issue of possessions. Indonesia quoted Convention between Great Britain and the Netherlands Defining the Boundaries in Borneo, 20 June 1891., Article IV:
"From 4° 10' North latitude on the east Coast the boundary-line shall be continued eastward along that parallel, across the Island of Sebittik (Sebatik): that portion of the island situated to the north of that parallel shall belong unreservedly to the British North Borneo Company, and the portion south of that parallel to the Netherlands."
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