| Otway Plain includes coastal plains and dunes, foothills with river valleys and swamps in the lowlands. Ridges mark the positions of successive shorelines associated with the long-term retreat of the sea. The soils associated with the upper terrain are texture contrast soils (Chromosols and Sodosols) and gradational texture soils (Dermosols), supporting Lowland Forest and Heathy Woodland ecosystems. The dunes are predominantly sandy soils (Podosols and Tenosols) and the floodplains and swamps are earths and pale yellow and grey texture contrast soils (Hydrosols) supporting predominantly Grassy Woodland and Plains Grassy Woodland ecosystems. Further information on the DSE website Otway Plain (OP) overview (including EVC Benchmarks for this region) (external site) | ![]() |