RT Report T1 Methodology for the Assessment of the Open Ocean A1 United Nations Educational, Scientific and Cultural Organization PB United Nations Environment Programme SN 978-92-807-3118-7 YR 2011 FD 2011 LK https://wedocs.unep.org/handle/20.500.11822/9332 UL https://wedocs.unep.org/handle/20.500.11822/9332 NO The open ocean is by international convention the largest transboundary space, with ocean areas beyond national jurisdiction covering about half of the surface of planet Earth (ocean areas under national jurisdiction cover a further 20 per cent), under the ultimate governance of the UN General Assembly. Governance of the open ocean is mediated largely through global international treaties based on particular themes (climate change, fisheries, pollution, biodiversity), as well as some regional conventions. DS UN Environment Document Repository RD Sep 24, 2026