October 23, 2013 by Karel

Contest #317 hint

It takes its name from a mineral found in the water here

2 Replies to “Contest #317 hint”

Ashwini Agrawal says:

October 23, 2013 at 12:50

Lake Natron Tanzania.
Per Svolsbru says:

October 24, 2013 at 18:17

Lake Natron, Tanzania

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