[2][3] The Peninsula is also considered as a volcanic arc of the region with several volcanoes active during the Holocene period is located on the area.

[3] Based on survey by Geological Department of Kota Kinabalu, the Skull Hill is said to be an island in its previous form but since the coral limestone terrace of the peninsula have risen from between 100 metres to 130 metres in the past 20,000 years, the hill are not island but a mountainous ridge near the coast.

[10] The narrow continental shelf fronting the coastal areas of both Dent and Semporna Peninsulas also could be exposed to future tsunamis with the active fault in the eastern coast.

[11] The climate of the peninsula is very hot and humid throughout the year with cloudy conditions and downpours occurring sometimes in the middle of April until the early month of May.

[2] The coast of the Semporna Peninsula is identified as a hotspot of high marine biodiversity importance in the Coral Triangle.