Why were the West African islands uninhabited?
score:49
First off, I'd ask you to look at my answer to a similar question about Madagascar and New Zealand. In particular it points out that historically uninhabited landmasses got populated by humans in one of 3 ways.
- By hunter-gatherers, walking there when the sea level was much lower at the end of the last glaciation
- By hunter-gatherers hopping there from nearby islands or landmasses using their small coastal craft.
- By farming people with ocean-going vessels (usually Austronesians).
In fact, one could probably extend #3 to say that pretty much every culture making use of method #3 above prior to the Renaissance was either Austronesian or Norse. There's probably some exceptions, but none come immediately to mind. A farming culture might have the capability of devoting enough resources and specialists to support open-ocean navigation and colonization, but still most cultures have better things to do.
So of the islands on the East side of Africa you mentioned:
- Zanzibar is only about 25 kilometers from the coast of Africa, so quite easy to stumble over in a coastal craft.
- Socotra has a series of small islands between it and the mainland.
- The Comoros and Seychelles are both thought to have been discovered by our old friends the Austronesians.
The West side of Africa islands you mention on the other hand are all hundreds of KM from the African coast, and the Austronesians and Norse are quite inconveniently far away (and would have to go way out of their preferred latitudes to get there).
Upvote:23
The Sahara
The Cape Verde islands are at the Southern edge of the Sahara and fairly far out to sea - traveling to the islands would require a multi-day deep sea journey of the kind that were rare prior to the age of sail.
The closest Africa comes to the Cape Verde islands is about 400 miles to Dakar. Checking Google Maps, you can see that Dakar is a dry location, unsuitable for the large trees you would need for ocean going vessels. The closest forested area to the Cape Verde islands is the mouth of the River Gambie - about 450 miles from the islands.
Importantly, Gambia is South of islands, so the Guinea Current works against any potential explorer from this direction.
Any explorer from coming from Gambia would need to travel 450 miles out to sea - for no apparently gain - going against the prevailing current. It's not hard to see what this did not occur.
From the North
From Casablanca in Morocco, it is nearly 1,500 miles to the Cape Verdes. From the "father of danger" Cape Bojador referenced in this question, it's still 800 miles. These represent multi-day, deep ocean voyages with no hope of resupply from the African coast. Lack of food and water would be serious obstacles.
The inability to fight the currents to return home and report a successful crossing were also significant obstacles. If no one returns to tell tales of successful trading or fishing, it discourages people from following in the future.
So the inhospitable coast near the Cape Verde, their distance from land, and the prevailing currents all made it difficult for explorers to find the islands.
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