Book excerpt: Baselines under the International Law of the Sea brings together two reports produced by the International Law Association (ILA) Committee on Baselines under the International Law of the Sea between 2008 – 2018. The Sofia Report (2012) is organized around the interpretation of Article 5 of the 1982 United Nations Convention on the Law of the Sea (LOSC) concerning the normal baseline. The Sydney Report (2018) is organized around a common methodology in assessing Articles 7, 8, 10, 13, 14 and 47 of the LOSC concerning straight baselines, closing lines, and straight archipelagic baselines.