I thought that show took place in Nevada.
Is Nevada still part of the USA?
The fictional Ponderosa ranch included the entire north shore of Lake Tahoe and yes, the TV Ponderosa was in Nevada.
I remember one episode where it was stated that the Ponderosa was “1000 square miles” in size. A square mile is 640 acres, so the fictional Ponderosa ranch would have been 640,000 acres.