Chott El Jerid - salt lake

We crossed the big salt lake Chott El Jerid. It's big, almost across Tunisia from the Algerian border to the sea. It is mostly dry, but in places water comes up and it is red. In the middle of the lake we stopped at a hut to have a cup of coffe. It was a young man and he served the coffe from a termos. He also wanted to sell sand roses. It is sand that creates crystals. He showed one and said he wanted 45 dinars. We had seen them before on the market where we could by five for one dinar so we told him we didn't want any. He discussed with us all the time and finally he was down to five dinars but as we had told him we didn't want any we just payed the coffe and continued.