Italian coasts are challenged by defining new perspectives for the built territories developed since the twentieth century. These territories have resulted in vast and often incongruous urbanized coastal belts driven by political, economic, and sociocultural factors such as mass tourism. These sprawling patterns blend seamlessly into landscapes and encompass diversities and identities. Various unique urban structures are found within fragmented systems rich in typological and morphological characteristics. Notable among these are the landscapes of seaside tourism second homes, ranging from apartment complexes and villas to campsites. Additionally, structured systems supporting tourism services, early twentieth-century tourism colonies, and various production landscapes—including those related to energy, chemical industries, and port and shipbuilding areas—contribute to shaping this complexity. A critical and constructive approach for these territories, leading to new scenarios, necessitates a thorough morphological comprehension; viewing the coastal territorial dimension as a designable entity shaped by an accumulative process of stratification and modification involves acknowledging the territory's concrete spatiality and architectural form with a specific grammar. This study examines structures, components, connections, and recurring patterns to establish a morphological point of view. It recognizes a grammar for coastal territories and identifies recurrent categories essential for understanding and designing at this scale. The research employs a critical approach to discerning and recognizing identifiable structures through disassembly, isolation, overlapping, and comparison processes. Recognizing spatial structures is essential for reinterpreting and recomposing the territorial dimension. This involves incorporating existing elements and striving for aesthetic elaboration and semantic attribution, combining and hybridizing these elements with contemporary sociocultural references and opportunities, thereby uncovering new meanings. In this context, the tools and methodological approaches of architectural composition address coastal territories, offering potential interpretations. This facilitates intervention in the spatial structures, redefining the relationships between their components and thereby facilitating coherence and meaning for the whole.