In the pre-Columbian era, modern Honduras was split between two pan-cultural regions: Mesoamerica in the west and the Isthmo-Colombian area in the east. Each complex had a "core area" within Honduras (the Sula Valley for Mesoamerica, and La Mosquitia for the Isthmo-Colombian area), and the intervening area was one of gradual transition. However, these concepts had no meaning in the Pre-Columbian era itself and represent extremely diverse areas. The Lenca people of the interior highlands are also generally considered to be culturally Mesoamerican, though the extent of linkage with other areas varied over time (for example, expanding during the zenith of the Toltec Empire).