Vessagiri, or Issarasamanarama, is an ancient Buddhist forest monastery that is part of the ruins of Anuradhapura, one of the ancient capitals of Sri Lanka. It is located about half a mile south of Isurumuniya, among boulders. Begun in the reign of King Devanampiya Tissa (mid-3rd century BC), the site was expanded during the reign of King Kasyapa (473 - 491 AD) to become home to about five hundred monks. 
The Vessagiri monks lived in rock shelters that were constructed by quarrying from local materials. Today's visitor sees only the bare stones - and not all of those, since much of the rock was later carted away and reused elsewhere. But when occupied, the dwellings were finished using wood and other perishable materials. 
- The Cultural Triangle of Sri Lanka, UNESCO 1993.
- A Guide To The Cultural Triangle Of Sri Lanka, by Edmund Jayasuriya. Central Cultural Fund, Colombo, 2004.
- Jayetilleke, Rohan L. (2005-10-12). "Vessagiriya - the monastery of the Vaisya-Setthis". Lanka Library. Retrieved 2009-04-14.
- "Drip-Ledge Cave". Art-and-archaeology.com. Retrieved 2009-04-14.
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