Various peoples had settled in the area of future Ecuador before the arrival of the Incas. The archeological evidence suggests that the Paleo-Indians' first dispersal into the Americas occurred near the end of the last glacial period, around 16,500–13,000 years ago. The first people who reached Ecuador may have journeyed by land from North and Central America or by boat down the Pacific Ocean coastline. Much later migrations to Ecuador may have come via the Amazon tributaries, others descended from northern South America, and others ascended from the southern part of South America through the Andes. They developed different languages while emerging as unique ethnic groups.