Rapids at Great Falls National Park, Great Falls National Park, Potomac River, Virginia; Canon EOS-1D Mark II, 28-135mm f/3.5-5.6 IS USM zoom lens at 38mm, Aperture priority and Evaluative Metering; ISO 400, f/11 and 1/640 sec; File ID: Y2F2079, full image 3504 x 2336.