Cahora Bassa is one of the largest hydroelectric schemes in southern Africa, a 171-meter concrete wall plugging the Zambezi where it begins its long run toward the Indian Ocean. The power it generates flows across borders - up into Zimbabwe, down into South Africa, stitching the regional grid together. Songo was purpose-built to serve this machine. The Portuguese planners didn't design a traditional African town around a market square; they designed staff housing, laid it across the hills, and let walking paths and service roads connect the pieces. The result is a settlement that feels more like a campus than a city, a series of loosely connected barrios with no clear center of gravity. Chapas - the minibus taxis that move most Mozambicans through their days - don't bother running circuits here. There is nowhere obvious to pick people up, and not enough people to make the route pay.

What could be an inconvenience turns out to be the town's best feature. The walking is spectacular. Songo sits in uplifted country above the Zambezi gorge, and the terrain climbs and falls in ways that keep the eye working. Wild fig and msasa trees frame views down toward the impoundment. Unlike much of central Mozambique, Songo seems to have slipped through the long civil war largely intact - the houses are kept up, the roads passable, the gardens tended. Travelers who have walked the ruined streets of other post-war towns remark on the contrast. Someone, clearly, has been paying attention. Residents credit the dam's stakeholders with keeping the place together; the electricity that powers three countries has quietly powered the upkeep of this one town.

You cannot simply drive up to Cahora Bassa and look at it. The dam is a secure site, and the gate guards will turn you away if you arrive unannounced. The workaround is local knowledge: ask around in Songo, and someone will eventually know someone who can arrange a tour. The approved route takes visitors down to the wall itself and, for the fortunate, inside to watch the turbines spinning. The drive up from Tete, the provincial capital 150 kilometers southeast, is a small pilgrimage in its own right. The paved route climbs through mountains with long sightlines back toward the river. An alternative dirt track runs north along the Zambezi bank, passing small villages and an abandoned monastery whose collapsing walls tell a quieter Mozambican story - of congregations left behind when colonial rule ended and the war made everything else more urgent.

Behind the dam, the Zambezi backs up into a long, forked reservoir that has become something of a legend among African anglers. Tigerfish - sleek, striped, armed with teeth that look borrowed from a piranha - cruise the deeper water, along with bream and the big catfish locals call vundo. Lodges line the shoreline offering boats and guides; the best fishing is well away from the wall itself, where local nets crowd the water and the fish have thinned out. Moringa Bay, on the main body of the reservoir, is where the serious anglers base themselves. Houseboats carry visitors deeper into the lake, where the Zambezi's old riverbed winds through drowned valleys and fish gather around submerged trees. At dusk, hippos emerge from the shallows and fishermen head in, and the dam wall becomes a thin pale line across the far horizon.