B-25s fly in front of Yishan/Ishan 宜山 (now Yizhou) in Guangxi province, SW China, among Karst peaks during the Japanese Ichigo campaign of summer and fall 1944. Towns along the Ichigo route were bombed by American planes as the Japanese moved into them, or sometimes in advance, to deny the resources of the towns to the incoming Japanese. The Japanese entered Yishan town on November 14, 1944, which should be the approximate date of this image. The Japanese stayed in Yishan until mid-June 1945, and allies bombed Yishan again in April 1945, bombing Japanese installations around the north east gates.
See related image here.