Rwandan coffee began to gain importance after international taste tests pronounced it among the best in the world, and the U.S. responded with a contribution of 8 million dollars. Rwanda now earns some revenue from coffee and tea export, although it has been difficult to compete with larger coffee-producing countries. The main source of revenue, however, is tourism, mainly mountain gorilla visitation. Their other parks, Nyungwe Forest (one of the last high-altitude tropical forests in the world) and Akagera National Park (a safari game park) have also become popular on the tourism circuit. The lakeside resorts of Gisenyi and Kibuye are also gaining ground.