Groundwater occurs as a thin lens of freshwater floating over seawater in small islands aquifers.The impacts of climate change and pressure on island resources have been the greatest threats faced by the small islands.This paper represents a case study of groundwater response towards the climate change and pressure on island resources in Manukan Island of Sabah,Malaysia.A modeling software SEAW- Groundwater occurs as a thin lens of freshwater floating over seawater in small islands aquifers. The impacts of climate change and pressure on the island resources have been the greatest threats faced by the small islands. This paper represents a case study of groundwater response towards the climate change. and pressure on island resources in Manukan Island of Sabah, Malaysia. A modeling software SEAW-