Ruy () or Ruj (Руј), is a mountain range in the Kraishte region on the border of western Bulgaria and southeastern Serbia. Its eponymous highest summit rises 1,706 meters above sea level. The mountain range is located west of Tran and formed the westernmost part of the Ruy-Verila range. On a clear day may be observed the ranges of Rila and Vitosha in Bulgaria and Veliki Strešer in Serbia.
Ruy is a typical massive, block-type mountain bounded by steep, faulted slopes. Its ridge is flat, at about 1600–1700 m above sea level. Its highest point is the eponymous summit of Ruy (1705.6 m), located in its western part, on the Bulgarian-Serbian border, at border pyramid No. 210.
It is formed of Proterozoic gneiss, and amphibolite and of Paleozoic and granodiorite. There are small deposits of lead, silver and copper ores. The soils are cinnamon and light brown forest soils. It is covered with a mixed deciduous forest of beech, oak and hornbeam, as well as extensive pastures at the highest altitudes.
In the easternmost part of the mountain range is situated the Tran Gorge, an important natural landmark and one of the 100 Tourist Sites of Bulgaria.
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