The Olt is a principal river of Romania, historically known in Latin as Aluta/Alutus. In modern usage it is referred to by names in several languages: Romanian Olt, Hungarian Olt or variant forms, and German Alt. It is a river of Romania (country) that crosses diverse landscapes from the Carpathian highlands toward the south.
Course and geographical features
The river rises in the mountain area of Harghita and descends through a sequence of valleys and gorges before entering lower plains. Along its course it cuts a notable defile through the Southern Carpathians, a narrow and scenic stretch often referred to as the Olt Gorge or Turnu Roșu pass. The valley has shaped local transport routes and settlements for centuries.
Administrative regions and tributaries
The Olt flows through several Romanian counties including Harghita, Covasna, Braşov, Sibiu, Vâlcea and Olt. It receives water from a number of feeders and sub‑basins; among the better known tributaries are the Cibin and the Lotru.
History and names
In antiquity the river appears in Roman records under the names noted above and the Olt valley contained a string of forts and routes used during Roman times (Roman era). Over the medieval and modern periods the river valley has continued to function as a corridor between Transylvania and the southern provinces.
Uses and importance
Today the Olt has multiple economic and environmental roles: it supports irrigation and agriculture in the lowlands, provides sites for hydroelectric plants and reservoirs along stretches of its course, and supplies water to towns and industry. Navigation is limited; the river is more important as a regional transportation corridor and a source of renewable energy and freshwater.
Ecology and notable facts
The river and its riparian zones host typical Central and Eastern European freshwater habitats and species. Conservation concerns focus on water quality, habitat connectivity and managing the effects of dams and urbanization. For further general reference on the river and its regional context see the entries on the river itself (river) and the country (Romania), and the language‑linked name pages (RO, HU, DE). Additional sources and regional studies can be consulted via local geographic and hydrographic services (Covasna, Sibiu, Vâlcea, Olt).