The Preclassic period in Maya history stretches from the beginning of permanent village life ca. 1000 BCE until the advent of the Classic Period ca. 250 CE, and is subdivided into Early (prior to 1000 BCE), Middle (1000-400 BCE), and Late (400 BCE- 250 CE). Major archaeological sites of this period include Nakbe, Uaxactun, Seibal, San Bartolo, Cival, and El Mirador in Guatemala; Cahal Pech, Blackman Eddy, and Cerros in Belize; and Calakmul, Yaxnohcah, Ichkabal, Komchen, and Xocnaceh in Mexico.