Nyamuragira, just now erupting, is one of the numerous Virunga Volcanoes, which form a large cluster of volcanoes spanning the border of Congo, Rwanda and Uganda, between Lake Ex-Edward (a.k.a. Lake Rutenzege) and Lake Kivu. The largest population center is Goma, on Lake Kivu, along the southern margin of the lava fields from these volcanoes, and made famous in recent years as the site of numerous excursions of warfare, refugee movements, and volcanic lava flows. I’ve written about Goma and a little about the Volcanoes in the Congo Memoirs.
Have a look at the following map: