This dataset is part of a BA/Leverhulme Small Research Grant entitled "A Sea of Opportunity" - The Maritime Dimension of Brexit Narratives (https://www.coventry.ac.uk/research/research-directories/current-projects/2023/a-sea-of-opportunity). This dataset maps occurrences of maritime phraseology using governmental, survey, and media archival sources between 2015 and 2022. It is useful for understanding how maritime phraseology helped shape narratives during the Brexit campaign, referendum result, and political aftermath. This is not an exhaustive list of maritime related terms; instead, it offers a snapshot of how pertinent the maritime dimension was in the context of Brexit. We draw on the following sources to compile the dataset: House of Commons Hansard debates that focus specifically on Brexit from January 2015 to December 2022. The digital archives of The Guardian (remain) and The Daily Mail (leave) between 2016 and 2022. ‘UK in a Changing Europe’ website. Extracting key maritime phraseology from 59 interviews with campaigners, politicians, civil servants and officials that were involved in the Brexit process. Interviews were carried out between 2020 and 2022. ‘What UK Thinks’ repository run by NatCen Social Research, which provides survey and polling data.