Paleoindian ancestors originated from Siberia. Before that, like all of humanity, their origins are in Africa. Homo sapien sapiens made their way out of Africa beginning 100,000 to 60,000 years ago. Along their route eastward they encountered Neanderthal and Denisovan groups as evident by the trace amounts in Native American genetics today. By about 25,000 years ago, paleoindian ancestors arrived in Beringia, an area of land located between present-day Alaska and Russia. This region of land was exposed as a result of a large portion of the earth's water trapped in glaciers. Paleoindian ancestors lived in Beringia for several thousand years before making their way south into the Americas. The most recent hypothesis for movement into the Americas involves traveling along the Pacific coast making use of both maritime and terrestrial resources. A coastal route would explain the rapid dispersal southward in a few thousand years. This rapid dispersal is key considering the age of some paleoindian sites like Bluefish Caves in Yukon, Canada (28,000 BP) and Monte Verde in Chile (18,000 - 14,000 BP).