Why it's the capital
Agha Mohammad Khan, the Qajar king, chose Tehran as the capital of Iran in 1786. Iran's capital had moved many times over its long history, and Tehran became the 51st.
Capital of IranTehran lies at the foot of the Alborz mountains in northern Iran. The city rises from about 1,040 m to 2,040 m above sea level, and Mount Damavand, Iran's highest peak, is nearby.
Agha Mohammad Khan, the Qajar king, chose Tehran as the capital of Iran in 1786. Iran's capital had moved many times over its long history, and Tehran became the 51st.
Find the Caspian Sea and aim just south of it, on the far side of the Alborz mountains that run along its southern coast.
Sources: Wikipedia: Tehran, Wikipedia: Alborz, Wikipedia: Tehran Conference