Ground transport in the Democratic Republic of Congo has always been difficult. The terrain and climate of the Congo Basin present serious barriers to road and rail construction, and the distances are enormous across this vast country. The DRC has more navigable rivers and moves more passengers and goods by boat and ferry than any other country in Africa, but air transport remains the only effective means of moving goods and people between many places within the country, especially in rural areas. Chronic economic mismanagement, political corruption and internal conflicts have led to long-term under-investment of infrastructure.