METREX, the Network of European Metropolitan Regions and Areas, is a non-profit organization that connects over 50 metropolitan regions across Europe. It serves as a platform for collaboration and knowledge exchange in metropolitan affairs, aiming to enhance the metropolitan dimension in European planning. The organization partners with European institutions, governmental bodies, and the research community to tackle strategic issues relevant to metropolitan regions. METREX participates in various EU projects, focusing on metropolitan cohesion policies and sustainability transitions. Key activities include hosting conferences, such as the Autumn Conference in Bucharest, and offering fellowships like the Bernd Steinacher Fellowship. METREX is open to new members and provides a newsletter to keep stakeholders updated on its initiatives.