Opodepe, to the West with Cucurpe, and to the Northwest with that of Ímuris. Municipal limits It has administrative limits with the following municipalities according to their location: This municipality has an area of 1,186.56 square miles (3,073.17 km²), which represents 1.7% of the state total and 0.14% of the national. Climate The Municipality of Arizpe has a dry climate and semi-warm, with a maximum average monthly temperature of 84.02° F (28.9° C) in the months of July and August; and a minimum monthly mean of 52.52° F (11.4° C) in the months of February and March; and an annual mean temperature of 68.18° F (20.1° C). The rains occur in summer, during the months of July and August with an annual average precipitation of 421.5 millimeters. Frosts occasionally occur from November to February. Topography In the western region of the municipality is the Sierra San Antonio, in the eastern area, the Sierra El Carmen, and from the north it penetrates towards the southern end of the Sierra El Manzanal. There are less rugged areas towards the center of the municipality on the vegas of the Bacanuchi River and the Sonora River. Hydrography The Sonora River crosses the municipality and is born in Ojo de Agua de Arvayo in the municipality of Cananea, with a continuous and permanent flow that will flow into the Abelardo L. Rodríguez Dam; the Bacanuchi river is born in Milpillas, a place also in the municipality of Cananea, and empties into the Sonora River. The most important streams of the municipality of Arizpe are: Piedras de Lumbre, Cuevas, San Cristóbal, Agua Caliente, Basochuca, Toro Muerto, Nogalitos. There are a dam named La Cieneguita, and two small reservoirs to be used in pasture lands. Flora and fauna Vegetation of oak forest exists in the municipality; it is located near the Sierra de San Antonio and Sierra El Carmen. A large extension of municipal territory is covered with grasslands (natural and induced). Towards the central and southern part the characteristic vegetation is made up of tropical scrub, palo dulce, copal, nopal, cat's claw and bilberry cactus. Small areas are dedicated to agriculture on the banks of the Sonora River. In the northeast of the municipality there are areas of thorny scrub. In the municipality there are the following species of animals: Amphibians: toad, frog. Reptiles: river turtle, mountain tortoise, little lizard, Sonoran coral snake, rattlesnake, lizard, and