The greatness of the lake of fire Not only is it the third largest water source in the country with an area of approximately 5,000 rai, it is also used as the first symbol of Phichit Province. The atmosphere around the Si Fai Lake is peaceful, beautiful and natural. Therefore, it has become a place of recreation for the residents of the city, one of the most important. And, no one can deny that the sunset in the Si Fai Lake is truly an impressive beauty.