The bordering Savusavu Hot Springs are mineral springs that initiate from rain, enter as groundwater that seeps into the hills and then flow deep into the interior of the earth. This water is heated, and then pressurized, as it gathers high mineral content and then it percolates back to the surface spouting in several outlets. The flow and temperature usually experience a marginal natural variance from season to season.  This is primarily related to amounts of precipitation that has been received.

There is always the chance that entirely new channels are being formed in the ground underneath when the seasonal flows are less than normal.

Where does the spring water come from?
Most of the rain that falls on the slopes of the hills ends up in the vegetation, and in shallow aquifers and underground rivers. Some of it, however, filters down through the pores and cracks in the hillside rocks, and is pulled by gravity to depths of three kilometers or more below the earth’s surface. Later, this water returns to the surface in our special Savusavu Hot Springs.

Why is it Hot?
As it seeps into the ground, the mineral water continues to heat up to impressive temperatures - interestingly it is heated in the earth's core by radioactive decay. Similar to a coffee percolator, as the water boils; intense pressure will force it upward. The temperature will be caused to fluctuate by the speed at which the water rises, and with the degree to which it mixes with colder contributing ground waters.

Click here to view Geological Diagram on the Thermal Hotsprings