Death Valley (Badwater Basin) is the lowest point in the lower 48, Death Valley is less than 100 miles away from the highest point in the lower 48  Mt. Whitney.

Death Valley is a desert valley located in Eastern California. Situated within the Mojave Desert, it is the lowest and driest area in North America. Death Valley has the record highest recorded air temperature in the world. Badwater Basin, located in Death Valley, is the point of the lowest elevation in North America at 282 feet (86 m) below sea level. This point is only 84.6 miles (136.2 km) ESE of Mount Whitney, the highest point in the contiguous United States with an elevation of 14,505 feet (4,421 m). Death Valley holds the record for the highest reliably reported temperature in the world, 134 °F (56.7 °C) at Furnace Creek on July 10, 1913. The previously-claimed world record air temperature, 136 °F (57.8 °C) in 'Aziziya, Libya, on September 13, 1922, has been officially deemed invalid by the World Meteorological Organization.
Located near the border of California and Nevada, in the Great Basin, east of the Sierra Nevada mountains, Death Valley constitutes much of Death Valley National Park and is the principal feature of the Mojave and Colorado Deserts Biosphere Reserve. It is located mostly in Inyo County, California. It runs from north to south between the Amargosa Range on the east and the Panamint Range on the west; the Sylvania Mountains and the Owlshead Mountains form its northern and southern boundaries, respectively. It has an area of about 3,000 sq mi (7,800 km²).Death Valley shares many characteristics with other places below sea level.