Postage stamps and postal history of Kionga

The Kionga Triangle was a tiny territory on the border between German East Africa (present-day United Republic of Tanzania) and the Portuguese colony of Mozambique (present day Republic of Mozambique), originally Portuguese, but occupied by German forces in 1894, and recaptured by the Portuguese forces in 1916. The triangle was the only German territory that the post-war Treaty of Versailles awarded to Portugal.

Source: Wikipedia — Postage stamps and postal history of Kionga (CC BY-SA 4.0)