Yuma is a desert community on the Arizona-California border, less than 30 mi (50 km) from Mexico. During the winter months the city sees its population double as an influx of visitors make their way to West Coast Arizona to enjoy Yuma's mild climate. Years before, the Gila River and the Colorado River converged nearby, making the city an important transportation and shipping hub. While the Gila has since been diverted, remnants of the river can be visited at McPhaul Swinging Bridge to Nowhere, which now spans rock and sand instead of water. Recreational opportunities are abundant thanks to the Colorado River, as it supports fishing along the banks and jet boating with local tour companies. While visiting the city, many people test their luck at the Paradise Casino, tour the historic sites, such as the Yuma Territorial Prison State Historic Park, and play a round of golf at the numerous local golf courses.