The lower part of Apollo 12 Hasselblad image from film magazine 50/Q - Orbital.
This is figure 1-2 of the Apollo 12 Preliminary Science Report, which has the following caption:

Shortly after translunar injection, the central portion of the United States was photographed. Lake Michigan can be seen in the upper left corner of the photograph. The river at the center of the photograph is the Red River, and the point of land visible in the lower right corner is the Yucatan Peninsula. The cloud formation suggests a frontal passage that is in the Gulf of Mexico.