## Why Seabed 2030?
### What Is the Magnitude of the Task?
For the other seven percent, The Nippon Foundation GEBCO Seabed 2030 Project, will take advantage of its connections with GEBCO and the IHO to work closely with local hydrographic agencies to obtain shallow water data wherever possible. Coastal states are generally responsible for mapping the regimes over which they have sovereign rights or obligations. Legal regimes cover areas that include the Territorial Seas up to 12 NM, the Exclusive Economic Zone (EEZ) to 200 NM from the coastline, and the limits of the juridical continental shelf (often referred to as the Extended Continental Shelf (ECS)), a legal definition of the continental shelf that can extend the sovereign rights of a coastal state well beyond 200 NM in some cases as per the United Nations Convention on Law of the Sea (UNCLOS). The establishment of the limits of the juridical continental shelf is based on the presentation of detailed mapping data to the Commission on the Limits of the Continental Shelf. This has led many coastal states to undertake ambitions seafloor mapping programs. These programs, as is the case, e.g., New Zealand, have often morphed into national mapping programs and can be a potential source of new mapping data into a global compilation. The total areas of ocean that are not under state jurisdiction, however, (The Area) still represents \(\sim\)50% (188,000,888 km\({}^{2}\)) of the total Earth surface covered by seas and oceans ([PERSON] et al., 2015). For those states who do not have well-developed mapping programs, the products of the Nippon Foundation--GEBCO Seabed 2030 Project may help them meet their Law of the Sea requirements. It is important also to consider, that our estimation is based on GEBCO's bathymetric database at the time of the compilation of the GEBCO_2014 grid. While we believe that this is the most complete bathymetric database available, we are fully aware that it is far from including all bathymetric data that has been collected (e.g., most ECS data collected by coastal states has not yet been made available to international data repositories). Identifying and retrieving data that has already been collected but that is not yet available for global compilations is thus another critical component of the Nippon Foundation GEBCO Seabed 2030 Project, highlighting the need for increased national and international collaboration and the coordination of regional and global bathymetric mapping initiatives. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Water Depth** & **Average** & **Proportion of Water** & **Proportion of Uncharted** & **Proportion of Uncharted** & **Cumulated Surface** & **Remaining** \\
**Water Depth** & **Depth (km)** & **Depth (\%)** & **Surface (This Interval)** & **Surface (Overall)** & **Grid Nodes from Interpolated Alimentary (km\({}^{2}\))** & **Front (Year)** \\ \hline \(>\)3000 & 4 & 75.3 & 85 & 69 & 230,910,385 & 188 \\
3000–1000 & 1.5 & 13.0 & 72 & 15 & 34,143,193 & 74 \\
1000–200 & 0.4 & 4.4 & 66 & 7 & 10,654,693 & 86 \\
200–0 & 0.1 & 7.3 & 71 & 9 & 18,995,603 & 619 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Calculated survey effort needed to completely map the world ocean.