Indonesia to Protest over a Chinese Fishing Vessel Near Natuna Islands

choi

Agustinus Beo Da Costa and Ben Blanchard, Indonesia to Summon China Ambassador Over Fishing Boat Incident. Reuters, Mar 20, 2016
http://www.reuters.com/article/us-indonesia-southchinasea
("a Chinese fishing vessel in the Natuna Sea")

My comment:
(a) There should be further development. For one thing, it is unclear how far the fishing vessel was away from the Natuna Islands.
(b) Natuna Islands
https://en.wikipedia.org/wiki/Natuna_Islands
(off the northwest coast of [Island of] Borneo; are the northernmost non-disputed island group of Indonesia)

Natuna Sea is around Natuna Islands. But in the Web I fail to find the boundaries of the Sea. Indeed the United States indicates Indonesia does not define the boundaries of the seas surrounding the nation. See
Limits in the Sea; No 141 Indonesia: Archipelagic and other maritime claims and boundaries. Bureau of Oceans and International Environmental and Scientific Affairs, United States Department of State, Sept 15, 2014, at page 6
http://www.state.gov/documents/organization/231912.pdf
("Indonesia has undelimited maritime boundaries with India (EEZ in the Andaman Sea), Malaysia (territorial sea and EEZ in the Strait of Malacca; territorial sea in the Singapore Strait; EEZ in the Natuna Sea portion of the South China Sea; all maritime zones in the Celebes Sea), Palau (EEZ and continental shelf in the Pacific Ocean), Philippines (continental shelf in the Celebes Sea),  Thailand (EEZ in the Andaman Sea), Timor-Leste (Timor Sea and Savu Sea), and Vietnam (EEZ in the Natuna Sea)" )
(c) Borneo
https://en.wikipedia.org/wiki/Borneo
(the third-largest island in the world and the largest island in Asia; in the north is Malaysian state of Sabah; named after Brunei)