Why it's the capital
The city was essentially founded after Britain handed its island site to France in 1887. Conakry became the capital of French Guinea in 1904, grew as an export port, and stayed the capital when Guinea became independent in 1958.
Capital of GuineaConakry stretches along the Kaloum Peninsula, which points south-west into the Atlantic Ocean from Guinea's coast. The peninsula is about 36 km long and in places only 0.2 km wide.
The city was essentially founded after Britain handed its island site to France in 1887. Conakry became the capital of French Guinea in 1904, grew as an export port, and stayed the capital when Guinea became independent in 1958.
Look on the Atlantic coast north of Freetown in Sierra Leone for a thin peninsula pointing south-west into the sea: Conakry fills that strip of land.
Guinea is a different country from its neighbour Guinea-Bissau to the north-west. Conakry is the capital of Guinea; Bissau is the capital of Guinea-Bissau.
Sources: Wikipedia: Conakry