The settlement began badly and got worse. Jacques de Pronis led the company's first expedition in 1642, and within months more than half his settlers were dead from fever at their first landing site. The survivors moved to the defensible headland over Tolagnaro bay and built the fort. Pronis married into a local ruling family to secure trade, but his rule curdled into cruelty. He killed a local prince and lured 73 Malagasy people into the fort under false pretenses, then enslaved them and handed them to a passing ship's captain. These were not statistics; they were men and women betrayed by the very leader who had married among them, and the act poisoned relations with the Antanosy for years. By the time the better-known governor Étienne de Flacourt arrived in 1648, the colony was already a tinderbox of broken promises.

Flacourt governed Fort Dauphin from 1648 to 1655, and though his colony struggled, his curiosity outlasted it. In 1658 he published Histoire de la grande isle Madagascar, one of the first serious European studies of the island. Buried in its pages are descriptions of creatures that have since vanished: the towering elephant birds, giant lemurs, and a dwarf hippopotamus that may still have walked southern Madagascar in his lifetime. Flacourt may be the only Westerner who recorded these animals while they possibly still lived. He died at sea in 1660, on the voyage home from Madagascar to France. The fort itself did not long survive the men who built it; by the late 1650s it had burned, and the French would not hold a steady presence here again for generations.

Geography made Taolagnaro both beautiful and isolated. The town sits on a narrow coastal shelf where the Anosy mountains crowd almost to the waterline, their slopes catching the moisture that feeds the last rainforests of the deep south. That isolation shaped its modern character. The overland routes to Toliara and the capital, Antananarivo, are notoriously rough, so Madagascar's national carrier became the practical lifeline, and the small airport handles much of the town's traffic with the outside world. Around it spreads a landscape of contrasts: white surf and palm-fringed coast on one side, dry spiny country not far inland, and a patchwork of forest that draws naturalists from around the world.

What pulls visitors to this far corner is wildlife. The Berenty Reserve, a thousand-hectare private sanctuary about 86 kilometers west, has been protected for over forty years and shelters six lemur species, the south's largest fruit-bat colony, and more than a hundred bird species; its single lodge books out months ahead. Closer still rise Andohahela National Park and the Tsitongambarika forest. But Taolagnaro is also a town of hard livelihoods. Sapphire rushes have drawn fortune-seekers to the region, and just northeast of town the Mandena ilmenite mine, run by a Rio Tinto subsidiary, digs titanium-rich sand from the littoral forest. The mine brought roads and jobs and bitter disputes over water and land, and the tension between conservation, mining, and the people who live here defines the modern Anosy region as surely as the old fort once did.