Yanchang County, Shaanxi Province
In 1907, a drilling rig on the west bank of the Yan River struck oil, and China burned its first domestically produced petroleum. The well was in Yanchang County, which sits in eastern Yan’an where the Yan River empties into the Yellow River. The county’s name means lengthening Yan — a reference to the river’s long course through its territory — and oil has flowed through much of that history. Ban Gu’s Book of Han from the 1st century notes…