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As the name suggests, the valley with a bed of (quartz) crystals. No crystals can be taken, under hefty penalty and/or jailtime.
a large, 10-m diameter sink hole that extends into a small underground cave that has been hollowed out of Roraima's black rock by thousands of years of constant rain.
Colorful (cold) water pools.
A few giant cracks in the rock/plateau.