La Unión is a town in central Peru, capital of the province Dos de Mayo in the region Huánuco. The city is over the Vizcarra river and has two districts, Agüamiro on the right bank and Ripán on the left bank. It has a regional hospital. Close to the city, over a flat highland or meseta (12,000 feet over sea level) is the old famed Inca city called Huánuco Pampa, Huánuco Marka or Huánuco Viejo. The most important festival is by the end of July and it is called "La Fiesta del Sol".