Angola is a neighboring country of the DRC, and also has a coastline on the South Atlantic Ocean. Both countries share some ethnic groups and languages, such as Lingala and Kongo.
Rwanda is a small landlocked country that borders the DRC to the east. It has a similar climate and biodiversity, and has a history of conflict and cooperation with the DRC, especially during the Rwandan genocide and the Congo wars.
Gabon is a relatively stable and prosperous country on the west coast of Central Africa. It has a similar colonial history as the DRC, as both were part of French Equatorial Africa. It also has a rich natural resource base, including oil, manganese, and timber.
Cameroon is a large and diverse country that spans from the Atlantic Ocean to the Lake Chad basin. It has a similar linguistic and cultural diversity as the DRC, as both are home to hundreds of ethnic groups and languages. It also faces similar challenges of governance, corruption, and security.
Equatorial Guinea is a small island nation and a mainland region on the Gulf of Guinea. It has a similar history of authoritarian rule and human rights violations as the DRC, as well as a dependency on oil revenues. It is also one of the few African countries that use Spanish as an official language.