 There are countless ancient ruins found throughout Sri Lanka, which are all indicative of a lost technology, and thus a lost civilization having once been responsible for their creation. One of the most striking of these, being the Sagiria Mountain, an ancient stronghold made atop natural plateau, a sanctuary far away from the troubles that would have presumably been occurring below. But one of the most astonishing relics found within this ancient land is a rather well-hidden one. Although the water reservoir built into the Sagiria site could offer one a subtle initial clue as to their existence, one would have to investigate the surrounding environment very carefully or be given local knowledge to ever find our next ancient anomaly in question. Hidden close by to the ancient mountainous stronghold, and now almost completely submerged into the surrounding landscape, Gargantuan Ancient Water Reservoirs, first documented by a Mr. Tenant from the UK and noted upon by William R. Corlis within one of his many volumes regarding lost civilization. Describing enormous water tanks found with the aid of the locals all completely aligned with equally cut square blocks. One of the tanks, which the locals knew by the name Petheriacorn, has since been measured to be around 7 miles in length, 300 feet broad, with 60-foot-high earthworks along its biggest embankments. They are largely believed to have been constructed to gain complete control and subsequent mastery of irrigation throughout an impressive span of land. We approached an expert engineer to find out just what sort of feet these giant tanks would be. We received back an estimated price of around $4 million to merely construct the largest sections of the earthworks. They were undoubtedly an unimaginably large undertaking, one which we believe was beyond the capabilities of any ancient group known to modern history. Perhaps the sheer enormity of the undertaking, along with the fact that they would have been far easier to conceal than that of the Great Pyramids, for example, is a possible motive as to why there isn't more known about these marvelous groundworks, or why there is very little documented study and why any that has been done was by independent historians. But regardless, we find these incredible gigantic hidden ruins highly compelling.