Stand at the shore and the geography reads as a long, gentle ramp tilted toward the sea. The coastal plain is wider in the south than the north, and behind it the green wall of the Fouta Djallon plateau rises like a held breath. From that plateau the rivers come west and never stop: the Fatala, the Konkouré, the Kolenté, all born in the high country and all spending themselves in the Atlantic. Where they meet salt water, the land gives way to inlets, tidal marshes, and estuaries thick with mangrove. Offshore, islands scatter into the haze. Conakry, the capital, sits on Tombo Island and the long finger of the Kaloum Peninsula, a city built on the very seam between continent and sea.

Conakry is one of the wettest capitals on Earth, and the calendar here is written in water. The dry season runs from November through March; the wet season arrives in April and does not relent until October. The heaviest rain falls in June, when the Inter-Tropical Convergence Zone swings overhead and the sky simply opens. About 4,300 millimeters fall on Conakry in an average year, more than four meters of water, while the temperature barely shifts from a steady 27 degrees Celsius. The red soils underfoot, laterite stained by iron, tell the rest of the story: this is a land scrubbed and saturated, where rust-colored earth meets a gray-green sea.

Maritime Guinea has never belonged to a single people. The Baga live along the coast itself, a people long tied to rice paddies wrested from the mangrove and to a sculptural tradition whose carved masks and headdresses became famous far beyond Guinea. South toward Conakry and across into Sierra Leone, the Susu predominate, and their language carries across the markets and fishing quays of the lowlands. In the north, where the plain narrows and the highlands press closer, the Fulani hold sway, the same herding people whose ancestors built a state in the mountains above. Three peoples, one wet and shifting coast, all of them shaped by the rivers coming down.

The defining ecosystem here is the mangrove, and to call it scenery undersells it. Mangrove forests are nurseries, storm walls, and carbon sinks at once, and Guinea's coastal estuaries hold some of West Africa's most extensive stands. Inland from the salt, the Guinean forest-savanna mosaic spreads its patchwork of woodland and grass, while pockets of lowland rainforest cluster around Conakry and southward toward Liberia. At low tide the mangrove flats glisten and the air smells of brine and rot and growth. At high tide the channels brim and the whole coast seems to lift. This is land that breathes with the moon.