The purpose of the supplement is to: Clarify the entry points and financial instruments to enhance access to coastal and marine NbS opportunities in the GCF; and, Provide a specifically coastal EbA and NbS lens that take into account the GCF’s requirements and priorities, as defined in the GCF Programming Manual and the GCF Updated Strategic plan, as well as the standards that ensure environmental integrity of nature-based approaches in coastal zones. Unlocking financing is necessary to support developing countries to implement and enhance their climate commitments and adaptation needs. An important source of grants and concessional finance is from the Green Climate Fund (GCF) for coastal and marine Naturebased Solutions (NbS). Ocean and climate issues are often intertwined, particularly for Least Developed Countries (LDCs) and Small Island Developing States (SIDS). Enabling the capacity of LDCs and SIDS to develop high-quality proposals is needed to unlock access to funding for NbS, including ecosystem-based adaptation (EbA) in a situation where the blue economy (i.e., available financing and scale of investment) continues to lag behind its terrestrial counterpart. For GCF proposals, one step towards building capacity is to clarify the available entry points for those types of proposals as well as outline key elements needed to create successful and high-impact proposals for coastal and marine NbS.