wunder beta⛰️ The Alborz Mountains: One Wall, Two Climates
See how the Alborz Mountains divide Caspian forests from Iran’s dry interior, shape Tehran’s water, and record an active continental collision.
What you’ll learn
- The climate wall
- Rainforest refuge
- Volcano and collision
- Water, routes, and the capital
Questions this course answers
What makes the Alborz a strong climate barrier?
Rising air loses moisture on the northern slopes, leaving a much drier rain-shadow to the south.
What does UNESCO say about the Hyrcanian forests?
UNESCO describes the forests as ancient refugia with more than 3,200 vascular plant species and endemic taxa.
Why is “extinct” too strong for Damavand?
No historic eruption is recorded, but ongoing thermal activity supports calling Damavand dormant rather than safely extinct.
Why do dams matter to Tehran?
Iranica identifies major reservoirs on Alborz rivers that supply Tehran and, in the Lar case, divert Haraz water toward Tehran and Varamin.
Grounded in trusted sources
- Encyclopaedia Britannica — Alborz Mountains (Western ~200 km / 125 mi; Central ~400 km / 250 mi; Eastern ~300 km / 185 mi; Caspian slopes humid and forested, southern slopes arid; two easy single-ascent passes: Kandovan between Karaj and Chalus, Gaduk between Hableh and Tala; Takht-e Soleyman more than 4,800 m; Karaj and Jajrud dams mainly supply Tehran)
- Encyclopaedia Britannica — Mount Damavand (about 5,610–5,670 m; ~68 km / 42 mi northeast of Tehran; isolated volcanic cone standing well above the surrounding ranges; current sources describe it as dormant rather than safely extinct)
- Encyclopaedia Iranica — ALBORZ iii. Geography (chain a little more than 500 km long, 60–120 km wide; central tract between Kandovān and Gadūk reaches 120 km; north-slope precipitation 1,000–2,000 mm; coastal plain 35 km max at Rašt and Bābol, a few km in western Māzandarān; Qazvīn 280 mm, Tehran 203 mm, Semnān 159 mm; Amir Kabir/Karaj dam 205 million m³, 1961; Latyan/Jājrūd 80 million m³, 1967; Lār 960 million m³ from 1983, diverting Harāz water toward Tehran and Varāmīn)
- U.S. Geological Survey EROS Earthshots — Elburz Mountains, Iran (range parallel to the southern Caspian; orographic barrier; heavy rainforest on northern slopes; rain-shadow valley to the south; Tehran in the south of the scene)
- UNESCO World Heritage Centre — Hyrcanian Forests (inscribed 2019; 25–50 million years; more than 3,200 vascular plants; ~280 Hyrcanian endemic/sub-endemic taxa; ~500 Iranian endemics; 180 bird species; 58 mammals including leopard, wolf, brown bear; serial site ~1,000 km along the Caspian; ~7% of remaining Hyrcanian forest in Iran; oldest trees 300–400 years, some possibly 500)
- Rezaeian, Carter, Hovius, Allen — Cenozoic exhumation history of the Alborz Mountains, Iran (Tectonics, 2012, doi:10.1029/2011TC002974): an effective rain barrier by about 17.5 Ma; shortening across the Alborz accounts for about 30% of the current 22 mm yr⁻¹ Arabia–Eurasia convergence
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