The Belém Statement (BS) on Atlantic Ocean Research and Innovation Cooperation and the Coordination and Support Action supporting its implementation, the AANChOR project, aims at further boosting research and innovation cooperation in the South Atlantic, notably between the European Union, Brazil and South Africa. WP7 aims to contribute to the implementation of the goals of the BS in promoting and facilitating the convergence and the alignment of Research and Innovation (R&I) infrastructure initiatives with a strong infrastructure component by proposing concrete collaborative initiatives (joint actions) in this field among institutions in European countries, South Africa, Brazil, Argentina, Cabo Verde and in other countries bordering the Atlantic Ocean.   The present document includes a full characterization of the proposed joint action addressing the convergence and alignment of R&I infrastructure initiatives, entitled All-Atlantic marine research infrastructure network (AA-MARINET) that was developed by experts included in WP7 sub-multistakeholder platform. The experts interacted since November 2019 to October 2020 to develop the current Joint Action that replies to the defined strategic and operational objectives and the Key Performance Indicators for WP7 platform. The proposed joint action aims to create a long-term collaboration framework to promote and facilitate the convergence and the alignment of Atlantic Research and Innovation infrastructure initiatives. AA-MARINET will support the implementation of the Belém Statement, by providing a forum and tools to support the development of a transatlantic network of RI initiatives and promote Trans-National Access (TNA) and other methods for sharing infrastructures in the Atlantic area