An anchialine pond is a brackish water pool near the ocean. The Kona coast of the big island is scattered with such pools.
Near the ocean the water table is quite high, often just a meter or so beneath the surface. These recent lava flows are highly fractured, riddled with cavities and lava tubes. Here the abundant fresh water from the mauna comes down to meet the seawater. The young lava rock is rich in nutrients and life flourishes in the dark crevices and chambers.
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