The forest is the main source of groundwater and thus the main water source for the half million people of the island, because rainwater penetrates directly into the aquifer through the cracks of the 'a'a lava under the forest.
O bosque é a principal fonte de auga subterránea e, polo tanto, a principal fonte de auga para o medio millón de persoas da illa, porque a auga de choiva penetra directamente no acuífero a través das grietas de lava baixo o bosque.