The Lake Nyungu crater is positioned northwest of Lake Mafuru. On its northern side, the wall elevates a mere 60 feet above the water level. However, towards the eastern side, it ascends to over 200 feet, while on the opposite side, it reaches approximately 150 feet. Cliffs measuring about 30 feet high extend from the northeast corner to the eastern side. Additional smaller outcrops are visible along the steep crater wall above and below this primary exposure. These formations predominantly comprise katungite tufts and volcanic breccias, containing an abundance of quartzite fragments, fewer instances of phyllite, occasional granite blocks, and sporadic occurrences of biotite-mafurite.
Not much is known about Lake Nyungu so far.