DOI: https://doi.org/10.14710/geoplanning.12.2.267-278

Extended Continental Shelf Under UNCLOS 1982: A Comprehensive Analysis of State Submissions

Muhammad Iqbal Taftazani  -  Doctoral Study Program in Geomatic Engineering, Department of Geodetic Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia , Indonesia
I Made Andi Arsana  -  Doctoral Study Program in Geomatic Engineering, Department of Geodetic Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia, Indonesia
*Nurrohmat Widjajanti  -  Doctoral Study Program in Geomatic Engineering, Department of Geodetic Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia, Indonesia
Clive Schofield  -  Faculty of Business and Law, Australian National Centre for Ocean Resources and Security (ANCORS), Wollongong, Australia, Australia

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Abstract

The United Nations Convention on the Law of the Sea (UNCLOS) establishes a framework for coastal states to confirm their continental shelf beyond 200 nautical miles from baselines, often referred to as the Extended Continental Shelf (ECS). This procedure, outlined in UNCLOS Article 76, requires states to submit extensive scientific and legal documentation to the United Nations Commission on the Limits of the Continental Shelf (UN-CLCS). While the technical and legal aspects of ECS delineation have been widely studied, research focused on the process’s broader effects on geospatial governance and marine spatial planning (MSP) is limited. This study aims to examine how the ECS delineation process contributes to geospatial governance and provides a spatial foundation for marine spatial planning. This research addresses this gap by analyzing the executive summaries of 34 successful ECS submissions receiving formal UN-CLCS recommendations. Using qualitative content analysis, the study examines specific criteria states have employed, including their survey methods, data sources, and how they applied UNCLOS formulas and constraints. The data include bathymetric, geophysical, geological, and sediment thickness information from national and international sources. The findings show that bathymetric surveys are used in all submissions, with many states also applying both the Gardiner and Hedberg formulas while consistently adhering to the 350-nautical-mile and 100-nautical-mile-beyond-2,500-m-isobath constraints. The study also highlights the key role of current and former UN-CLCS members in providing expert advice to ensure submissions are scientifically sound and legally valid. Beyond technical aspects, the ECS submission process improves geospatial clarity, decreases jurisdictional uncertainty, and supports sustainable ocean governance.

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Keywords: Continental Shelf; Submission; UN-CLCS

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Section: Original Research
Language : EN
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  1. Altvater, S., Fletcher, R., & Passarello, C. (2019). The Need for Marine Spatial Planning in Areas Beyond National Jurisdiction BT  - Maritime Spatial Planning: past, present, future (J. Zaucha & K. Gee (eds.); pp. 397–415). Springer International Publishing. https://doi.org/10.1007/978-3-319-98696-8_17">[Crossref]

  2. Arsana, I. M. A. (2007). The Delineation Of Indonesia’s Outer Limits Of Its Extended Continental Shelf And Preparation For Its Submission: Status And Problems. Paper for the UN-Nippon Fellowship, New York.

  3. Baumert, K. A. (2017). The Outer Limits of the Continental Shelf Under Customary International Law. American Journal of International Law, 111(4), 827–872. https://doi.org/10.1017/ajil.2017.84">[Crossref]

  4. Baumert, K. A. (2024). The Continental Shelf Beyond 200 Nautical Miles: Announcement of the U.S. Outer Limits. American Journal of International Law, 118(2), 275–298. https://doi.org/10.1017/ajil.2024.14">[Crossref]

  5. Division for Ocean Affairs and the Law of the Sea. (2021). Submissions, through the Secretary-General of the United Nations, to the Commission on the Limits of the Continental Shelf, pursuant to article 76, paragraph 8, of the United Nations Convention on the Law of the Sea of 10 December 1982. United Nations Office of Legal Affairs. https://www.un.org/depts/los/clcs_new/commission_submissions.htm">    

  6. Douvere, F. (2008). The Importance of Marine Spatial Planning in Advancing Ecosystem-Based Sea Use Management. Marine Policy, 32(5), 762–771. https://doi.org/10.1016/j.marpol.2008.03.021">[Crossref]

  7. Earle, S. (2019). Physical Geology - 2nd Edition (2nd ed.). BCcampus.

  8. Ehler, C., & Douvere, F. (2009). Marine Spatial Planning: A Step-by-Step Approach Toward Ecosystem-Based Management. Intergovernmental Oceanographic Commission and Man and the Biosphere Programme. https://doi.org/http:/dx.doi.org/10.25607/OBP-43">[Crossref]

  9. Evans, M. D. (2001). Continental Shelf Limits: The Scientific and Legal Interface. Edited by P. J. Cook and C. M. Carleton. [Oxford: Oxford University Press. 2000. xiv + 363pp. ISBN 0–19–511782–4. £47.50. (H/bk.)]. International and Comparative Law Quarterly, 50(3), 743–744. [Corssref]

    " target="_blank">%2010.1093/iclq/50.3.743">[Corssref]

  10. García-Carriazo, Á. J. (2022). Submissions to the Commission on the Limits of the Continental Shelf: Practice and Controversies. Maritime Affairs: Journal of the National Maritime Foundation of India, 18(1), 1–11. https://doi.org/10.1080/09733159.2022.2080376">[Crossref]

  11. Geddis, E., Wood, R., & Stagpoole, V. (2019). Legal Continental Shelf: Geology, Geophysics, and Tectonics. In H. K. Gupta (Ed.), Encyclopedia of Solid Earth Geophysics (pp. 1–6). Springer International Publishing.

  12. Government of the Republic of Indonesia. (2008). Continental Shelf Submission of Indonesia Partial Submission in respect of the area of North West of Sumatra: Executive Summary. https://www.un.org/depts/los/clcs_new/submissions_files/idn08/Executive20Summary.pdf">  

  13. Government of the Republic of Indonesia. (2018). Continental Shelf Submission of The Republic of Indonesia Partial Submission in respect of The Area of North Papua: Executive Summary. https://www.un.org/depts/los/clcs_new/submissions_files/idn1_83_19/2019-02-01_IDN-Executive_Summary.pdf">  

  14. Government of the Republic of Indonesia. (2020). Continental Shelf Submission of the Republic of Indonesia Partial Submission in respect of the Area Southwest of Sumatera.

  15. Government of the Republic of Indonesia. (2022). Continental Shelf Submission of The Republic Indonesia Partial Submission in respect of the area of South of Java and South of Nusa Tenggara: Executive Summary. https://www.un.org/depts/los/clcs_new/submissions_files/submission_idn3_93_2022.htm">  

  16. International Hydrographic Organization. (2020). a Manual on Technical Aspects of the United Nations Convention on the Law of The Sea-1982 (TALOS) - Sixth Edition.

  17. Jay, S., Alves, F. L., O’Mahony, C., Gomez, M., Rooney, A., Almodovar, M., Gee, K., de Vivero, J. L. S., Gonçalves, J. M. S., da Luz Fernandes, M., Tello, O., Twomey, S., Prado, I., Fonseca, C., Bentes, L., Henriques, G., & Campos, A. (2016). Transboundary Dimensions of Marine Spatial Planning: Fostering Inter-Jurisdictional Relations and Governance. Marine Policy, 65, 85–96. https://doi.org/10.1016/j.marpol.2015.12.025">[Crossref]

  18. Lebrec, U., Paumard, V., O’Leary, M. J., & Lang, S. C. (2021). Towards a Regional High-Resolution Bathymetry of the North West Shelf of Australia based on Sentinel-2 Satellite Images, 3D Seismic Surveys, and Historical Datasets. Earth System Science Data, 13(11), 5191–5212. https://doi.org/10.5194/essd-13-5191-2021">[Crossref]

  19. Magnússon, B. M. (2015). The Continental Shelf Beyond 200 Nautical Miles: Delineation, Delimitation and Dispute Settlement (Vol. 78). Hotei Publishing.

  20. Matindas, R. W., & Villanueva, K. J. (2017). Pulau-Pulau Terluar dan Batas Wilayah Nasional, Status Delimitasi Batas Wilayah Nusantara. Jurnal Hukum & Pembangunan, 33(1), 134. https://doi.org/10.21143/jhp.vol33.no1.1377">[Crossref]

  21. Pinto, F. L. (2020). An Interpretation of Article 76, Paragraph 6, of UNCLOS. Revista Chilena de Derecho, 47(3), 873–900.

  22. Roberts, J., Mossop, J., & Badal, M. R. (2025). Planning for the Management of the Extended Continental Shelf: The Unique Situation of the Mascarene Plateau Region of the Western Indian Ocean. Ocean Development & International Law, 56(2), 232–254. https://doi.org/10.1080/00908320.2025.2477061">[Crossref]

  23. Schofield, C., & Arsana, I. M. A. (2009). Beyond the Limits?: Outer Continental Shelf Opportunities and Challenges in East and Southeast Asia. Contemporary Southeast Asia, 31(1), 28–63. http://www.jstor.org/stable/41288788">  

  24. Schofield, C., Bernard, L., & Arsana, I. M. A. (2024). The United States Announcement on Extended Continental Shelf Outer Limits: Implications for the Asia-Pacific? Asia-Pacific Journal of Ocean Law and Policy, 9(1), 168–181. https://doi.org/10.1163/24519391-090100011">[Crossref]

  25. Suarez, S. V. (2010). Commission on the Limits of the Continental Shelf. Max Planck Yearbook of United Nations Law Online, 14(1), 131–168.

  26. Suarez, S. V. (2013). The Commission on the Limits of the Continental Shelf and its Function to Provide Scientific and Technical Advice. Chinese Journal of International Law, 12(2), 339–362. https://doi.org/10.1093/chinesejil/jmt016">[Crossref]

  27. Sutisna, S., & Lokita, S. (2011). Indonesia First Experiences in Delineating Extended Continental Shelf to The UN-CLCS. Indonesian Journal of International Law, 8(4), 682–692.

  28. Symonds, P. A., & Moore, G. F. (2000). Characteristics of Continental Margins. In Continental Shelf Limits. Oxford University Press.

  29. U.S. Extended Continental Shelf Project Office. (2023). World Map of Extended Continental Shelf (ECS) Areas, Version 1.0. U.S. Department of State. https://www.state.gov/world-map-of-extended-continental-shelf-ecs-areas/">  

  30. United Nations Convention on the Law of the Sea, (1982).

  31. United Nations. (2022). Commission on the Limits of the Continental Shelf (CLCS): Submissions to the Commission. Division for Ocean Affairs and the Law of the Sea. https://www.un.org/depts/los/clcs_new/commission_submissions.htm">  

  32. United Nations Commission on the Limits of the Continental Shelf. (1999). Scientific and Technical Guidelines of the Commission on the Limits of the Continental Shelf.

  33. United Nations Commission on the Limits of the Continental Shelf. (2021). Rules of Procedure of the Commission on the Limits of the Continental Shelf. In The Legal Order of the Oceans. Bloomsbury Publishing Plc. https://doi.org/10.5040/9781509955572.0064">[Crossref]


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