Teheranno (alternatively Teheran-ro, translation "Tehran Boulevard") is a street in the Gangnam district of Seoul, South Korea. It runs from Gangnam Station through Yeoksam-dong and into Samseong-dong. It is colloquially known as "Teheran Valley" (after Silicon Valley) due to the number of internet-related companies operating there. The district of Gangnam-gu experienced phenomenal growth and waves of construction, with Teheranno becoming one of the busiest streets in South Korea. Its counterpart, Seoul St. in Tehran, runs in the north of that city, close to the Evin district.