Denver used to be a major trading center for beef and livestock when ranchers would drive (or later transport) cattle to the Denver Union Stockyards for sale. As a celebration of that history, for more than a century Denver has hosted the annual National Western Stock Show, attracting as many as 10,000 animals and 700,000 attendees. The show is held every January at the National Western Complex northeast of downtown.
Denver is in the center of the Front Range Urban Corridor, between the Rocky Mountains to the west and the High Plains to the east. Denver's topography consists of plains in the city center with hilly areas to the north, west and south. According to the United States Census Bureau the city has a total area of 155 square miles (401 km2), of which 153 square miles (396 km2) is land and 1.6 square miles (4.1 km2) (1.1%) is water. The City and County of Denver is surrounded by only three other counties: Adams County to the north and east, Arapahoe County to the south and east, and Jefferson County to the west.