📜 One of the world's largest subterranean water complexes, Ali Sadr Cave offers a unique boat tour through its vast, 11km underground labyrinth. 🔍 The water temperature is a constant 12°C, and the standard tour includes a 1470m boat trip through extensive channels, lakes, and chambers. # Why Go 🌊 Experience one of the world's longest underground boat trips (1470m). ✨ Marvel at clear waters, fantastical rock formations, and stalactite ceilings. 🗿 Explore massive chambers like Wedding Room and Freedom Hall, and ancient human occupation sites. 🕰️ Discover prehistoric paintings and ancient history (12,000 years old). 🤫 Enjoy a surreal, otherworldly atmosphere in silent grottoes. # Why Avoid ⚠️ Surrounding area has many shops selling 'nick-nacks and rubbish'. # Tips 🧥 Bring a jacket and wear comfortable shoes, as the cave is chilly and involves walking and stairs. ⏰ Arrive early, especially on Fridays or holidays, to avoid crowds. ⏳ Allow 2-3 hours for the full tour, which includes walking and a boat trip. 🚌 Shuttles and taxis are available from Hamadan, about an hour away. # Hours 🕒 Daily, tour takes 2-3 hours.