La Unión is situated in the Region of Murcia in the southeast of Spain. It has an area of 24.6 km². It has a population of 16,180. It has the elevation of 86 m. Its average annual temperature is 17 °C. It has balmy winters. The sun shines 320 days per year. La Unión is situated in one of the sunniest areas in Europe; this kind climate makes possible the many leisure activities, popular fiestas, sports, and cultural activities that are held in the town.