Kush. The valley is enclosed on all sides by mountains, and is intersected by glens and ravines. Above mountains ridges to the west is the valley of the Panjkora River, to the north the Gilgit Valley, and Indus River gorges to the east. To the south, across a series of low mountains, lies the wide Peshawar valley. The northernmost area of Swat district are the high valleys and alpine meadows of Swat Kohistan, a region where numerous glaciers feed the Usho, and Gabral rivers (also known as the Utrar River), which form a confluence at Kalam, and thereafter forms the Swat river - which forms the spine of the Swat Valley and district. Swat then is characterized by thick forests along the narrow gorges of the Kalam Valley until the city of Madyan. From there, the river courses gently for 160 km through the wider Yousufzai Plains of the lower Swat Valley until Chakdara. Climate Climate in Swat is a function of altitude, with mountains in the Kohistan region snow-clad year round. The upper areas of the region are relatively colder and often get snowfall in the winter. Drier, warmer temperatures in the lower portions in the Yousafzai Plains where summer temperatures can reach , although the lower plains experience occasional snow. Both regions are subject to two monsoon seasons - one in winter and the other in summer. Swat's lower reaches have vegetation characterized by dry bush and deciduous trees, while the upper areas mostly have thick pine forests. History Ancient The Gandhara grave culture that emerged c. 1400 BCE and lasted until 800 BCE, and named for their distinct funerary practices, was found along the Middle Swat River course. Greek In 327 BCE, Alexander the Great fought his way to Odigram and Barikot and stormed their battlements; in Greek accounts, these towns are identified as Ora and Bazira. After the Alexandrian invasion of Swat, and adjacent regions of Buner, control of the wider Gandhara region was handed to Seleucus I Nicator. Gandhara In 305 BCE, the Mauryan Emperor conquered the wider region from the Greeks, and probably established control of Swat, until their control of the region ceased around 187 BCE. It was during the rule of the Mauryan emperor Ashoka that Buddhism was introduced into Swat, and some of the earliest stupas built in the region. Following collapse of Mauryan rule, Swat came under control of the