Ideas concerning the initial peopling of the Baja California Peninsula have dramatically changed in recent decades. In the late 19th and early 20th centuries, the native inhabitants of the southern part of the Baja California Peninsula were believed by some to have come from Melanesia, based on the perceived similarity in skull morphology. Since the middle of the 20th century, most researchers propose that initial populations entered from the north by land, bringing with them 2 distinct cultural traditions. The first wave was thought to have been an incursion of Paleoindians with Clovis-type fluted points. The second wave refers to groups who occupied ancient lake shores, such as Laguna Seca Chapala, and who were considered as belonging to the Western Pluvial Lakes (WPL) tradition. Eventually people moved down to the southern tip of the peninsula, pushed by subsequent groups. The entry of human groups from the Mexican mainland across the islands in the central Gulf of California has also been suggested; early entries by other groups have been proposed as well. A migration from Australia to the Cape Region across the southern Pacific has also been argued. This paper summarizes recent archaeological evidence from radiocarbon dates, geomorphological settings, subsistence strategies, and material types and technologies indicating that Paleocoastal migrants may have reached the Cape Region during the Terminal Pleistocene. However, some of the early lithic artifacts and technologies in the Cape Region show similarities to the WPL tradition, such as leaf-shaped points, an eccentric crescent, and end and side scrapers. This evidence suggests that perhaps a Paleocoastal group and a WPL group reached the southern part of the peninsula at around the same time and that they had some kind of interrelation that is reflected in their lifestyles and materials, which were principally adapted to coastal life. Las opiniones acerca del poblacion inicial en la peninsula de Baja California cambiaron drasticamente en las ultimas decadas. A fines del siglo XIX y principios del siglo XX, se creia que los habitantes nativos del sur de la peninsula de Baja California provenian de Melanesia, basandose en la similitud percibida en la morfologia craneal. Desde mediados del siglo XX, la mayoria de los investigadores proponen que las poblaciones iniciales ingresaron por tierra desde el norte, trayendo consigo dos tradiciones culturales distintas. Se penso, que la primera ola inmigratoria se debio a la incursion de paleoindios con lanzas acanaladas de punta Clovis. La segunda ola se refiere a grupos que ocuparon las antiguas orillas de los lagos, como el de Laguna Seca Chapala, quienes fueron considerados como pertenecientes a la tradicion de los lagos pluviales occidentales (WPL, por sus siglas en ingles). Eventualmente, la gente se traslado al extremo sur de la peninsula, impulsada por subsecuentes grupos. Asimismo, se sugirio el ingreso de grupos humanos por tierras mexicanas, a traves de las islas del Golfo central de California, y la entrada de otros grupos en epocas mas recientes. Finalmente, se argumento la migracion proveniente de Australia hacia la Region del Cabo en el Pacifico sur. Este articulo resume reciente evidencia arqueologica obtenida mediante datacion por radiocarbono, las caracteristicas geomorfologicas, las estrategias de subsistencia y tipos de materiales y tecnologias, indican que los migrantes paleo costeros pudieron llegar a la Region del Cabo a finales del Pleistoceno. Sin embargo, algunos de los primeros artefactos y tecnologias liticas en la Region del Cabo, tales como lanzas con forma de hoja, laminas en forma de media luna excentricas y raspadores laterales, muestran similitudes con los de la tradicion de WPL. Esta evidencia sugiere que probablemente un grupo Paleo costero y un grupo de los WPL llegaron al sur de la peninsula casi al mismo tiempo y tuvieron alguna clase de interrelacion, la cual se refleja en sus estilos de vida y materiales, que se adaptaron principalmente a la vida costera.