Rethinking ACMECS amidst Changing Regionalism in Southeast Asia Article The Ayeyawady-Chao Phraya-Mekong Economic Cooperation Strategy (ACMECS) was revived in 2018 in part to provide its members with an alternative source of funding to enhance connectivity in mainland Southeast Asia. Within an area congested with multilateral frameworks, overlapping agendas and an abundance of funding, ACMECS faces formidable challenges ahead to stay relevant. By Chanintira na Thalang and Attakrit Patchimnan