The European transnational cooperation process, implemented via the ongoing 15 EU INTERREG- B programmes, is integrated in the second objective of EU Cohesion Policy: European Territorial Cooperation. Aiming to promote better cooperation and regional development processes within the European Union by a joint approach to tackle common issues, the EU transnational cooperation programmes are key to tackling transnational development bottlenecks and to better exploring transnational territorial capitals. Currently, there are ongoing discussions within the European Commission to delimit the new EU Cohesion Policy post-2020 INTERREG-B programmes. In this context, this article summarises the main conclusions of four invited speakers of an international conference which took place on 21 June 2019 at the Instituto Universitário de Lisboa. The conference aimed to present some of the key contributions towards territorial development of the EU of EU Cohesion Policy and, in particular, of three INTERREG-B programmes: North West Europe (NWE), South West Europe (SUDOE), and the Atlantic Area.

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