In 2019 and 2020, The Regional Agency for Archaeological Research in D.I. Yogyakarta Province, Indonesia conducted archaeological research in the western part of the Gunung Sewu karst region, Java. The aim of the project was to provide new insights into the archaeological record of this region to compare with the more intensively researched areas in the eastern part of Gunung Sewu. One rockshelter chosen for investigation was Song Pedang, a site currently located approximately 2.6 km from the coast. The 2019 excavations produced evidence for a subsistence strategy focussed heavily on consumption of marine resources. In this presentation, we will discuss temporal variations in the exploitation of marine resources at Song Pedang and make comparisons with other prehistoric cave and rockshelter sites in the west, middle and eastern parts of Gunung Sewu.