IMG 2868
The underground river eroded these concave surfaces along each bend. You can see this process in action in the active underground rivers of Central America, e.g. the Caves Branch in Belize
DATE: 11/12/05 9:45 AM   |   CAMERA: Canon (Canon PowerShot S50)   |   ORIGINAL RESOLUTION: 2592 x 1944   |   FLASH: Flash did not fire, auto   |   SHUTTER SPEED: 1/640s   |   METERING MODE: Center weighted average   |   APERTURE: 2.8   |   FOCAL LENGTH: 7.09375mm   |   EXPOSURE MODE: Program   |   EXPOSURE BIAS: 1/-3 EV   |   ISO SETTING: Auto   |   WHITE BALANCE: Auto   |  


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