What is "mayombe"

Mayombe (or Mayumbe) is a geographic area on the western coast of Africa occupied by low mountains extending from the mouth of the Congo River in the south to the Kouilou-Niari River to the north. The area includes parts of the Democratic Republic of the Congo, Angola ( Cabinda Province), the Republic of the Congo and Gabon. In the Democratic Republic of the Congo, Mayombe is part of the north-western province of Kongo Central on the right bank of the River Congo, and contains the cities and towns of Lukula, Seke Banza, Kangu and Tshela.