Land-water interaction in the Malili Lakes area can be explained by a external and internal scales. The first is expressed as surface water flows while the second is the underground ecotones, in the soil, cracks, joints, fractures, and caves along the boundary zone between high and low groundwater table. A clear and sharp boundary between the two does not exist, a grey boundary area might have exist for at least two million years.
The surface water flow of the external scale is the product of the tropical climate and tectonics that shaped the landscape, fill the rivers and valleys, feed the biodiversity flora and fauna, regulate the micro-climate, and controlled the evapotranspirationcycle to the sky. The water flow into the lake left its signature as gravity flows from the steep Lake Matano rim that effect the hydro-chemistry of whole lake water column. An oligotrophic water quality of 133 m3/sec it produces is critical to sustain the 265 MW hydro-power it generate along the Larona River.
At the internal scale, a stable groundwatertable fluctuation zone underlying the fractured ultrabasic rocks during the last two million years have created a laterite layer rich in nickel ore. Limestone and marble rocks adjoining the ultrabasic rocks may have been effected by these underground flows. The million years ofleaching process that dillute the underlying rocks produce an anomalous water chemistry balance with unique element compositions. This unique geohydrochemistry differ from other lakes of the world, they also shaped the ecosystem of endemic species in the lake, a condition that need tedious research and explanations.
Sustainable water quantity and quality of the Larona River should be maintained through a better understanding of the land-inland water interactions. Water pollution can be minimized through consistent implementation of ompany vission and a broad public campain of awareness for a better understanding of the ecosystem functions to sustain and benefit people's economy and sustain their daily life activities.

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