The British merchant Gok mentioned in the mid-17th century that during his travels he came to a spring near the Emba River that spouted oil instead of water.
Pedagang Inggris, Gok, menyebutkan pada pertengahan abad ke-17 bahwa selama perjalanannya ia datang ke mata air dekat Sungai Emba yang menyemburkan minyak, bukan air.