Penny's Lagoon is a 'perched' or 'suspended' lake.
A perched lake is formed in a depression above the regional water table, in the vadose zone.(see diagram) Sand is cemented together with decomposed organic matter (such as leaves, bark and dead plants) and aluminium and iron, creating an impermeable layer on the base of the lake. The layer of rock or sediment is above the main water table but below the surface of the land. This natural, almost waterproof lining holds the water as would a dish. No stream or underground aquifer feeds into or flows out of the lake.
• Diagram courtesy of the U.S. Geological Survey
The water of perched lakes is generally acidic (pH of less than 6) and and they have extremely low levels of dissolved solids, suspended solids and nutrients
To log this cache please email the answers to the following questions:-
1. Is the water clear or cloudy? Why?
2. Where in the world can other suspended lagoons be found?
As an optional extra, please post a photo of yourself in the area.