Arunapuram is located in the midland region of Kerala, a transitional zone between the coastal lowlands to the west and the mountainous Western Ghats to the east. The geography is characterized by rich, fertile soil that heavily supports tropical agriculture and lush vegetation.
The most prominent natural feature in the vicinity is the Meenachil River, which winds its way near the village. The river not only provides a vital water source for agriculture but also shapes the local ecosystem. The landscape is predominantly green, covered with extensive rubber plantations, coconut groves, and mixed-crop homesteads. The region is rich in groundwater, though the river experiences significant fluctuations in water level between the monsoon and summer seasons.