The 100 KM long 7th stage of the Qinghai Lake tour started at the yellow river .
The 100 KM long 7th stage of the Qinghai Lake tour went up to 3800 meters ( 11,500 feet ) .
The 100 KM long 7th stage of the Qinghai Lake tour started at the yellow river and went up to 3800 meters ( 11,500 feet ) .