Sand dunes dominate the landscape in the North Algodones Dunes Wilderness Area.
ATV rider heads into sunset. Hiker Algodones Dunes Sunflower Off-Highway Vehicle Slipface
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Lake Cahuilla... 

Long ago, the Colorado River flowed through country so flat that its course constantly changed as silt deposits blocked its flow.  At times, the river flowed into the Gulf of California, while at other times it headed west into a low lying area called the Salton Sink.  Each time the sink filled with river water, a large lake formed.  This lake was called Lake Cahuilla.  It covered over 100 miles, stretching from Palm Springs southward into Mexico.

Each time the river changed its course from the sink to the Gulf of California, the lake dried up, leaving behind miles of sandy beaches.  Northwesterly winds blew across the dry lake bed and swept the sandy beaches to the southeast.  Eventually, the sand piled up on itself and formed dunes.

What stops the dunes from blowing further south?

Ancient Lake Cahuilla is illustrated, stretching form Palm Springs southward into Mexico.  The lake was a direct result of the meanderings of the Colorado River, appearing and disappearing over time at the river's whim.  Illustration:  BLM/Joy Fatooh

Nothing stops the dunes from blowing south.  In fact, the dunes move south-eastward at about 1 foot per year!

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