Siddha Cave or Siddha Gufa is a cave located in Bimalnagar, Tanahu District, Nepal. At 437m deep and 50m high, Siddha Gufa is said to be the largest cave in Nepal. It provides the astounding experience inside the darkness of the cave. Its cathedral-like interior is full of stalactites and stalagmites, not to mention hundreds of bats, which whistle overhead.