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Cooling down in the lake, and then watching the sun setting over the dunes while soaking in a hot spring is a surreal experience.
BBC: Siwa: An Egyptian oasis
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Once over the top of a high dune, you come to a hot spring, the size of a large jacuzzi, where sulphurous water bubbles in a pool and runs off to irrigate a garden.
BBC: Siwa: An Egyptian oasis
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In traditional geothermal energy, engineers drill near a geyser, hot spring or volcano, stick a valve and turbine on the hot water, and that's pretty much it.
FORBES: Magazine Article