°C (79 °F), the consequence could be catastrophic rains. Although ocean waters can drop to 19 °C (66 °F) during the dry winter months (May to October), they can also rise to 27 °C (80 °F) during the humid summer months (December to April); this calls for pleasant rains; yet if the temperatures rise 1 or 1.5 °C degrees above that, El Niño is assured. During the hottest days of summer (December to April), temperatures can reach almost 40 °C (104 °F) inland. During night time, 30s or even high 20s may seem unpleasant, which urge people to go to beach resorts such as Máncora or Colán. The rest of the months have pleasant summer temperatures in the low 30s and mid 20s °C (77–90 °F). Natural resources and wildlife Piura is a land of unique algarrobo trees, a variety of mesquite similar to the carob, and it is the region with the most equatorial tropical dry forests in the whole Pacific. These ecoregions carry a unique variety of orchids, birds, reptiles, plants and mammals. Piura is known for the best and oldest lime-lemons in South America as well as South America's finest mango (tropical dry). With Lambayeque, it is the original home of Pima cotton. Piura also produces bananas, coconuts, rice and other fruits as local income. The "Manglares de San Pedro de Vice" in Sechura Province of Piura are the southernmost mangroves on the Pacific coast of South America. Its development has been favoured also by the petroleum found in the ocean of Talara Province, fishing is blessed by two ocean currents, silver mines are common and the current Bayovar Deposits are present as well. History The most important culture that developed in the Piura region was Vicús, which stood out for its ceramics and delicate work in gold. The Tallanes or Yungas, however, were the first settlers, who migrated from the Sierra. During a period that is still vague, they lived in behetrias, which were primitive settlements without a head or an organization. Later they were conquered by the Mochicas and, centuries later, by the Incas, during the rule of Tupac Inca Yupanqui. In 1532, Francisco Pizarro founded the first Spanish city in South America on the banks of the Chira River in the Tangarará Valley. He named it San Miguel de Piura. The founding date is still subject of controversy. However, during the 450th anniversary celebrations,