Concepción earned its nickname - La Perla del Norte - the way river ports often did: through money. At the turn of the twentieth century, yerba mate and timber from across northern Paraguay and the Brazilian state of Mato Grosso poured into the city, were loaded onto boats, and floated downriver to Argentine ports for shipment to Europe and Asia. The trade brought Italian, Spanish, and Arab immigrants, and they left their fortunes in stone. Walk the compact grid of streets today and you pass the Mansión Otaño, the Villa Ida, and a procession of aristocratic Italianate manors, their decorated facades a memory of when this sleepy town of 83,000 was one of the busiest commercial hubs in the country.

The city began not as a pearl but as a shield. Governor Agustín Fernando de Pinedo founded the Villa Real de la Concepción on 25 May 1773 to guard Spanish territory against two threats: the Mbayá peoples of the region and the Portuguese, who pressed constantly westward from Brazil. For nearly forty years it stayed a pure military outpost, no civilians permitted, until 1812 finally opened it to settlers. War never strayed far. In late 1864 Mariscal Francisco Solano López sent a river expedition of some 3,000 soldiers upriver from this port to attack Brazil's Mato Grosso - the opening blow of the catastrophic War of the Triple Alliance. Years later, after López met his death at Cerro Corá to the east, his wake was held in this same city.

Life in Concepción still bends toward the water. There is a public beach beside the port where families gather on weekends to swim and fish, and the sunsets over the Paraguay River draw quiet crowds. Across the channel lies the island of Chaco'í, home to a handful of families who row to the mainland each morning to work, their dirt lanes lined with farm animals and crops and a single small church. North of the city, the Aquidabán River unrolls some of the country's finest beaches - broad stretches of yellow sand - while the Tagatiyá stream runs so clear it has become locally famous for its colored little fish.

For a remote cattle port, Concepción carries a surprising cultural weight, much of it owed to one man. The painter Carlos Colombino, born here in 1937, became one of Paraguay's most important artists and a fierce critic of the Stroessner dictatorship. He pioneered a technique he called xilopintura - carving and painting thin sheets of wood into large, otherworldly panels - and gave his work titles like El Torturado, the tortured one. Colombino helped found museums across the country, including Concepción's own Museo de Arte Contemporáneo. The city keeps three museums in all, each tied to a different era: the trading boom, the war years, and the present.

Most travelers come to Concepción for what lies beyond it. This is the staging point for the Pantanal - the vast wetland straddling Paraguay, Bolivia, and Brazil - reached by sailing the Aquidabán north toward Fuerte Olimpo and Bahía Negra. It is also a base for the touristic estancias of the surrounding ranchland, for sport fishing on the river, and for the limestone cave country around Vallemí. During holidays the city fills with anglers from Pedro Juan Caballero and Brazilians from across the border, drawn to a place that has quietly traded its commercial grandeur for something rarer: a foothold at the edge of the map.