A terrace for crops, a long road and an 800-metre (2,600 feet) long wall was also found under the waters of the lake, sited in the Andes mountains between Bolivia and Peru. Dating back 1,000 to 1,500 years ago, the ruins are pre-Incan.
The Lake Titicaca drilling project recovered a 136-m-long drill core of sediments from the bottom of Lake Titicaca at a depth of 235 m and at a location just east of Isla del Sol. This core contains a continuous record of lake sedimentation and paleoenvironmental conditions for Lake Titicaca back to about 370,000 BP. For this period of time, Lake Titicaca was typically fresher and had higher lake levels during periods of expanded regional glaciation that corresponded to global glacial periods. During periods of reduced regional glaciation that corresponded to global interglacial periods, Lake Titicaca had typically low lake levels