Indo-Malaysia Ocean

The "Indo-Malaysia ocean" likely refers to the maritime areas shared by Indonesia and Malaysia, specifically the Strait of Malacca, South China Sea, and Celebes Sea. These bodies of water play a significant role in the region's trade and geopolitics, with the Strait of Malacca being a crucial shipping lane.
The maritime boundaries between Indonesia and Malaysia are located four bodies of water, namely the Strait of Malacca, Strait of Singapore, South China Sea and Celebes Sea. The territorial seas of both countries (both claim a 12-nautical-mile (22 km) territorial sea) only meet in the Straits of Malacca and Straits of Singapore. Territorial sea boundaries also exist at the continuation of both ends of the land boundary between the two countries in Borneo. Only continental shelf boundaries have been agreed to in the South China Sea while the continental shelf boundary in the Celebes Sea has not been determined at all.
South China Sea
Both Indonesia and Malaysia have maritime boundaries within the South China Sea, with some areas of overlap and disagreement.
Celebes Sea
This sea also has overlapping maritime claims between the two countries, particularly at the eastern end of Borneo.
Continental Shelf
Agreements exist regarding the continental shelf boundaries in the South China Sea, but not for the Celebes Sea.
Currently, both nations are in a territorial dispute over the oil-rich islands of Ambalat. Previously, they were over territorial disputes over the islands of Ligitan and Sipadan, which were won by Malaysia.
The recent border disputes have arisen in Straits of Malacca and the South China Sea area mainly because of the disagreement on exact locations of maritime naval borders in these waters. Both parties involved in arresting and detaining their counterpart's officials and fishers accused of territorial breaching violations and illegal fishing.
Disputes
There have been historical and ongoing disputes, particularly concerning the Ambalat region in the Celebes Sea, and disagreements over the exact locations of maritime boundaries in the South China Sea.<ref name=":3" />
 
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