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This overview proposes a novel typology of characteristics required to ensure that marine assessment and management is connected, coherent and/or equivalent across boundaries, both within or between national and international jurisdictions. This defines the types of connectivity, coherence nature and equivalences with their relevance and examples in a marine transboundary context. It indicates the way of identifying impediments to be addressed to ensure that the management across marine boundaries is sustainable and adequate, and it also gives examples of the way of overcoming those barriers. The typology covers natural environmental, governance (policies, politics, administration and legislation), economic and management regimes. It encompasses sector (e.g. fishing, navigation, etc.) and their activity-, pressures-, effects- and management response-footprints and Maritime Spatial Planning and Marine Protected Area-designation. This links monitoring, assessment and reporting across boundaries and within the physico-chemical and ecological realms and in marine conservation across boundaries. Finally, it shows connectivity, coherence and equivalence should reflect wider societal and cultural aspects as well as governance approaches, principles and outcomes in adjacent countries (States) and regions. These aspects are summarised by analysing the so-called 10-tenets for sustainable and successful marine management. Although this typology is developed largely from a European and North America perspective, it is proposed here for validating with examples in other areas worldwide. • A typology of marine transboundary issues is proposed. • The typology covers marine connectivity, coherence and equivalence. • These aspects cover the natural and societal environment, management and governance. • Examples presented from North America and Europe are relevant globally. • Examples of impediments and the means of overcoming them are given. [ABSTRACT FROM AUTHOR]