Altyaghach National Park, National park in Khizi and Siazan districts, Azerbaijan

Altyaghach National Park is a protected area in eastern Azerbaijan featuring forests, mountains, and meadows at roughly 940 meters in elevation. The landscape combines different terrain types that support diverse wildlife and plant life.

The park was established in 2004 as an important step in Azerbaijan's environmental protection efforts following the country's independence. This decision reflected growing commitment to preserving natural areas within the newly independent nation.

The name Altıağac means "six trees" in Azerbaijani, referring to a landmark cluster of trees in the area. The park lies in the Khizi and Siazan districts, about 120 km from Baku, and its forests are dominated by Caucasian oak, oriental beech and Persian ironwood, with hawthorn, dog rose and blackberry in the undergrowth.

The park lies about 120 km from Baku, in the Khizi and Siazan districts. Annual rainfall is only around 430 mm, 42% of it in the warm half of the year, and evaporation exceeds rainfall by 1.4 to 1.6 times, so the ground is dry. Temperatures range from -23 °C to 40 °C.

The Ussuri sika deer was once kept within the reserve here, but the animals were later moved to Hirkan National Park. The East Caucasian tur, a mountain goat-antelope found only in the eastern half of the Caucasus Mountains, also lives in the park.