Guinea is around the same size as Great Lakes.

Great Lakes is approximately 243,839 km² (94,147 sq mi), while Guinea is approximately 245,857 sq km, making Guinea 1% larger than Great Lakes.
Tip: This to-scale comparison of Great Lakes vs. Guinea uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.