Buying land

Hello guys,
I am looking to buy land in the south of Gabon. Im looking for something that is near the beach, and it can perfectly well be far away from Libreville, it does not have to have a connection to a road, does not have to be urbanized. Only a strip of beach and a good land mass to cultivate. I am thinking of something like 50 hectares. I would occupy it, build a house, and give it agricultural and tourism use. Do you know who would I have to contact about this? Keep in mind I'm offering to connect some of the land to the already existing roads. Is it possible to buy cheap land directly from the government?  Any estimated prices on not urbanized land?  Maybe near lake mandje or maybe even near Mayumba national park.
Thanks in advance