What is the fine-grained topic of the following text: The Northern Corridor anchored by the port of Mombasa in Kenya, and the Central Corridor, anchored by the port of Dar es Salaam in Tanzania, are principal and crucial transport routes for national, regional and international trade of the five East African Community (EAC) countries, namely; Burundi, Kenya, Rwanda,Tanzania and Uganda. Only return the topic.
Principal Transport Routes in East African Community (EAC) countries