The Kionga Triangle was a small territory on the border between German East Africa (largely overlapping present-day Tanzania) and the Portuguese colony of Portuguese Mozambique (present day Mozambique), totalling just 1000 km² (400 mi²).
Originally, the Germans established this as their outpost south of the Rovuma River, and there was a settlement called Kionga of 4,000 inhabitants (1910), now Quionga. But in 1916, during World War I, the Portuguese occupied it. After the war, the Treaty of Versailles defined the border as running along the Rovuma, thus allotting the triangle to Mozambique. When Mozambique became independent on 25 June 1975, the Kionga remained with it, as part of Cabo Delgado Province.
- Thomas, H.B., "The Kionga Triangle", Tanganyika Notes and Records Volume 31 1951, pp. 47–50.