The gold was real, and so was the cost. Philip II of Spain, ruling from Madrid in the late 1500s, thought enough of the mountain village to grant it the grand title "Villa de Sant Antonio del Zerro de Oro de Zaruma." The royal court wanted metal; the metal came out of tunnels dug by Indigenous people who had been enslaved for the purpose. Production peaked in the late sixteenth and seventeenth centuries, then shuddered to a halt in January 1749 when an earthquake collapsed the workings. A local rebellion followed, and the crown was forced to share some of the proceeds with the surviving miners before operations resumed. Spain kept importing El Oro gold until 1820, when independence finally cut the supply line.

In 1882, a new republic trying to organize itself carved off a southwestern wedge of coast and called it El Oro. The first capital was Zaruma, the old gold town up in the hills. Two years later, the political center slipped down to Machala, on the muddy flatlands where commerce actually happened. Gold kept flowing, though now through private companies paying taxes to Quito rather than tribute to a distant king. Then came the bananas. As the mines' yields faded in the twentieth century, growers discovered that El Oro's climate - hot, wet, and reliable - produced one of the world's great bananas. The province converted itself from a mineral economy to an agricultural one, and Machala began calling itself the banana capital of the world.

In July 1941, Peruvian forces crossed into El Oro and occupied nearly the entire province. The Ecuadorian-Peruvian War was brief - weeks, really - but it left scars that the coastal towns still remember. The Rio Protocol of 1942, signed under pressure from neighboring states, formalized a border that Ecuador would dispute for the rest of the century. For the province named after its buried wealth, the 1941 occupation was a reminder that geography sits beside neighbors with their own ambitions. The Jambelí Islands, the fringe of mangrove coast, the lowland plains that grow the bananas - all of them nearly became someone else's territory.

Beyond Machala's docks and the gold hills of Zaruma, El Oro holds surprises. The Puyango Petrified Forest on the Peruvian border preserves Araucaria logs that fell more than 100 million years ago, turned to stone by volcanic ash and mineral-rich groundwater. The Jambelí archipelago strings along the Gulf of Guayaquil in a tangle of mangroves where Afro-Ecuadorian fishing communities have worked the tides for generations. Inland, the town of Piñas produces coffee so good it has won international cups. Shrimp ponds stretch across what used to be estuary, a second great export alongside bananas, generating billions of dollars and hard debates about where the mangroves used to be.

The 2020 projection counted about 715,000 people in El Oro, making it Ecuador's sixth most populous province. The 2010 census found the population mostly mestizo, with meaningful Afro-Ecuadorian and Montubio minorities reflecting centuries of Caribbean and lowland coastal culture layered atop Indigenous roots. In Zaruma, Republican-era wooden buildings still climb the steep hill; the town has been nominated for UNESCO World Heritage status for its timber-built mining architecture. Down in Machala, the pace belongs to the port: ship horns, cooling trucks, and the relentless churn of bananas moving toward the world's tables.