What is the largest natural freshwater lake in Thailand, located in Sakon Nakhon province?

• A Bueng Boraphet
• B Bueng Chawak
• C Nong Han ✓
• D Kwan Phayao

Nong Han in Sakon Nakhon province is the largest natural lake in northeastern Thailand at approximately 125 square kilometres, fed by several streams and draining into the Mekong via the Songkhram River.