Bush taxis will take you south from Libreville. Catch a taxi for Tchibanga early in the morning - the trip can take over 12 hours. Bring water, toilet paper and snacks, and ask to sit in the cabin of the truck, preferably in the passenger seat. The drive down is an experience in itself. There is also an airport in Tchibanga, though it is really little more than an air strip. Flights are extremely unreliable and can be dangerous.
