Khorram Abad is a city in and capital of Lorestan Province. At the 2006 census, its population was 328,544, in 75,945 families. Khorramabad is situated in the Zagros Mountains. Khorramabad has Mediterranean Climate and experiences hot low humid summers and cold wet winters.
The city has one of the highest levels of annual rainfall in Iran particularly in the spring and winter. The history of the city dates back to the Elamite era when it was named Khaidalou. The Sassanids (226-651 CE) founded a city named Shapur-Khwast on the ruins of Khaidalou and Shapur I (215-270 CE) built a fortress there, which is known today as Falak-ol-Aflak Castle.
Khorramabad is famous for its lush landscape, from scenic waterfalls and green valleys to forests, rivers and natural springs. One of the most famous natural attractions of the city is the 48-meter Bisheh Waterfall, which is surrounded by oak trees.