and quail sacrifice; paper and rubber as sacrificial offerings; pantheon of gods or spirits; acrobatic flier dance (see the Danza de los Voladores and the Totonac flier dance; 13 as a ritual number; ritual period of 20 x 13 = 260 days; mythic concept of one or more afterworlds and the difficult journey in reaching them; good and bad omen days; a religious complex based on a combination of shamanism and natural deities, and a shared system of symbols Language: a linguistic area defined by a number of grammatical traits that have spread through the area by diffusion Geography Located on the Middle American isthmus joining North and South America between ca. 10° and 22° northern latitude, Mesoamerica possesses a complex combination of ecological systems, topographic zones, and environmental contexts. These different niches are classified into two broad categories: the lowlands (those areas between sea level and 1000 meters) and the altiplanos, or highlands (situated between 1,000 and 2,000 meters above sea level). In the low-lying regions, sub-tropical and tropical climates are most common, as is true for most of the coastline along the Pacific and Gulf of Mexico and the Caribbean Sea. The highlands show much more climatic diversity, ranging from dry tropical to cold mountainous climates; the dominant climate is temperate with warm temperatures and moderate rainfall. The rainfall varies from the dry Oaxaca and north Yucatán to the humid southern Pacific and Caribbean lowlands. Cultural sub-areas Several distinct sub-regions within Mesoamerica are defined by a convergence of geographic and cultural attributes. These sub-regions are more conceptual than culturally meaningful, and the demarcation of their limits is not rigid. The Maya area, for example, can be divided into two general groups: the lowlands and highlands. The lowlands are further divided into the southern and northern Maya lowlands. The southern Maya lowlands are generally regarded as encompassing northern Guatemala, southern Campeche and Quintana Roo in Mexico, and Belize. The northern lowlands cover the remainder of the northern portion of the Yucatán Peninsula. Other areas include Central Mexico, West Mexico, the Gulf Coast Lowlands, Oaxaca, the Southern Pacific Lowlands, and Southeast Mesoamerica (including northern Honduras). Topography There is extensive topographic variation in Mesoamerica, ranging from the high peaks circumscribing the Valley of Mexico and within the central Sierra Madre mountains to the low flatlands of the northern Yucatán Peninsula. The tallest mountain in Mesoamerica is Pico de Orizaba, a dormant