The Amboni Caves are the most extensive limestone caves in East Africa. They are located 8 km north of Tanga City in Tanzania off the Tanga-Mombasa road. The caves were formed about 150 million years ago during the Jurassic age. It covers an area of 234 km². According to researchers the area was under water some 20 million years ago. There are altogether ten caves but only one is used for guided tours.

It is not known when the caves were exactly discovered but reports indicate that ethnic groups such as the Segeju, Sambaa, Bondei and Digo who lived near the caves used it for prayers.