<![CDATA[Sustainable investment governance has emerged as a critical imperative in contemporary international economic law, addressing regulatory fragmentation, legal uncertainty, and the integration of environmental, social, and governance (ESG) principles into investment regimes. This study examines the harmonisation of sustainable investment legal frameworks through debottlenecking mechanisms from a three-continent comparative perspective: Asia (Indonesia), Europe (the European Union), and Africa (the AfCFTA framework). Using a normative legal research methodology that draws on statutory, conceptual, and comparative approaches, the analysis evaluates primary legal instruments and secondary doctrines to assess legal coherence, regulatory efficiency, and institutional coordination. The findings reveal distinct yet convergent regional trajectories: Indonesia advances investment facilitation by streamlining regulations and strengthening institutional coordination; the European Union reinforces its framework via foreign direct investment (FDI) screening and green transition policies prioritising economic security; and Africa, under the AfCFTA, fosters a sustainability-oriented regime incorporating ESG obligations with developmental priorities. Despite normative and institutional variations, all three regions exhibit a gradual convergence toward harmonised governance. The study concludes that effective harmonisation necessitates regulatory coherence, cross-jurisdictional policy alignment, and responsive mechanisms to resolve investment bottlenecks within a sustainability-oriented legal framework.]]>
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