to 1999. This project intensively surveyed 15 km of the Maderas half of the island over five field seasons. The project mapped 73 archaeological sites within this area, including almost 1700 petroglyph panels on 1400 boulders. Of the 73 sites surveyed by the Ometepe Petroglyph Project, petroglyphs were recorded at all but one. Many of the petroglyphs on Ometepe contain spirals, and “meander” across the rock face. Stylized turtles are a common motif for the area. The petroglyphs of Ometepe include some forms which are less common. Figures in many of the depictions are described as having “bowling ball faces” on human figures. As noted above, spirals are common, and are apparently used in several ways. Two attached spirals appear to represent the island, with its two volcanoes. Spirals also are used to depict the head of anthropomorphic figures. Some figures resemble Mesoamerican depictions of Nagual, suggesting the shared practice of Tonal spirituality. Some of the unusual formations seen within the petroglyphs on Ometepe include seats or steps carved into boulders, ovals, and big grooves. The purpose behind these forms has not yet been explained. Between the 1995 and 1996 field seasons, ten sites were recorded. The greatest concentration of petroglyphs was noted at N-RIO-3, probably recorded by Haberland as Om-38. Located along the slopes and at the top and of a ridge, the site contains 82 boulders with petroglyphs, six mortars, two metates and a scatter of ceramics and chert lithics. Of the 149 petroglyphs recorded during 1996, most were located on land owned by the cooperative at the hacienda. When the program was expanded in 1997, to include volunteers, 20 volunteers participated in recording fifteen additional sites. The most impressive site, N-RIO-19, was greater than 180,000 square meters in area. Ninety-two petroglyphs, over 30 house mounds, stone statuary fragments, and pottery from at least three different periods of occupation were recorded at the site, and the material was being studied in Managua. The Ometepe Petroglyph project is an interesting example of modern technology assisting in the recording of archaeological sites. As the prehistoric art sites were being surveyed and recorded, pictures were taken of each site in both color and black and white. A video was even made at one site. Photos were then uploaded into a computer, and the Photoshop program was then used to increase the contrast of the photos, increasing the visibility of the petroglyphs