I'm a bit confused as to why you would advertise to borrow money on this forum. And why bitcoin?

As for collateral, unless you are looking for someone specifically based in Turkey, this has to be a safe and liquid form of debt security. A land title deed will work if the lender qualifies to own land in Turkey. I'm not sure what the laws are about foreigners owning land there but this is murky territory, considering Turkey's diplomatic conflicts with the EU and US at present.

Good luck with finding a lender with a very fat XBT wallet. 100 BTC will require extensive due diligence and lots of serous discussions about the repayment terms, especially now that the Turkish Lira is not doing very well.