The Minister for Foreign Affairs Simon Coveney has met Welsh First Minister, Mark Drakeford in Cardiff today, for the inaugural Wales-Ireland Forum – an annual meeting of Irish and Welsh ministers and officials.
Mr Coveney also opened Ireland's new Consulate General in Wales.
The Wales-Ireland Forum is designed to deepen links between the two governments after Brexit.
"We launched an ambitious framework for the Ireland Wales relationship earlier this year and one of our shared priorities was to deepen cooperation in important sectors," Minister Coveney said.
"Today's Forum will be an excellent platform for doing so."
Climate change and sustainability is a significant part of the Forum's work, and Minister for the Environment, Climate and Communications Eamon Ryan was due to take part by video link.
The Forum will also develop joint work on Housing, Energy, Education and culture and Language policies.
Ireland is Wales' fourth biggest trade partner.
The Forum is organised jointly by the Irish Consulate General in Cardiff, and the Welsh Government Office in Dublin.
"The re-establishment of the Consulate is testament to Ireland’s commitment to increasing cooperation and collaboration with Wales across the business, arts, sporting and community sectors," Minister Coveney said.
"Ireland and Wales are the closest of neighbours, and we have a strong and positive relationship built on age-old connections and a deep cultural understanding.
"Our modern and vibrant relationship has grown from historic links, common heritage and culture, and close people-to-people, business, cultural and sporting connections."