Yasin is located in the Northern Areas of Pakistan. Apart from the  main Valley, it includes several side-valleys, such as Thaus, Nazbar, Thui, Qorkulti, Sandhi, Asumbar,Barkulti, Hundur Darkut. The sbottom of the valley rises from 2160m in the south up to over 2700m near the village Darkut. Especially North of Darkut where a lofty range separates the catchment area of Yasin from that of Yarkhun River, the surrounding peaks reach altitudes of more than 6000m.

Villages and fields are located along the river, mostly on the alluvial fans of tributaries. Due to the arid conditions at the valley bottom and at the lower slopes, agriculture is only possible by means of irrigation. The streams and torrents from which irrigation channels are diverted originate from glaciers, which are extensive especially in the northern part of the area.

The gradual increase in the precipitation and the concomitant decrease in the temperature from the valley bottom to higher altitudes are the main constituents in the development of the several vegetation zones.

These vegetation zones vary considerably in terms of their value as pasture. The alpine grasslands possess the highest value, even if they can only be used during the summer season when they are not covered with snow. By contrast, the Artemisia steppes are free of sow for longer period, but of lower fodder value.

The wastelands at the lower altitudes hardly lend themselves to regular use as pastures, while the irrigated areas provide several sources of fodder (i-e weeds from the fields, grass from the fringes of the fields and small plots of irrigated meadows). Goats and sheep sometimes also graze in the mushk of the riverbed, an area which is easily accessible during the winter season although it is only of very limited use as source of forage.

The population of Yasin amounts about 35000 inhabitants. They are divided into various patrilineal groups (qo’om) of distinct origin and social prestige. The larger villages generally consist of a number of hamlets which are mostly inhabited by the number of the qo’om. Households of these hamlets often combine into larger groups (giram or mo’n) in order to cooperate in the socio-religious and agricultural activities, such as entertaining guests at wedding and funerals or spreading manure (Dhelk) in the fields, respectively.

The yasen valley, and in the particular the characters it produced, has played a leading role in the history of the region .Continually fought over by the rulers of both Chitral and Gilgit, the history of the rulers of Yasin reads like a catalogue of patricide, fratricide and avunculcide.Yasin came to the attention of Victorian Britain following the murder of British explorer George Hayward in (Darkhot) the upper reaches of the valley.

Biddulph classifies the original inhabitants of the valley as Yashkuns, despite the fact that the Yasenichoo(the people of Yasen) are Boorushey. The majority of the valley are the Ismaili Muslims leading their life along with the guiding principles outlined by Prince Karim Aga Khan the 49th Imam of the Ismailies.The Yaseninchoo speak Brushaski. ( Brushaski spoken here is different from that in Hunza.The original form of the language being the language of Brushoo is spoken here) The brooshaski here is more archaic dialect than the Brooshaski spoken in Hunza and Nagar.In the past the rulling class( Rajas) used to speak Khawar(Chitrali), reflecting their origins to the Chitral in the west. Today many residents of Yasin are bilingual. The valley is sometimes referred to as Warshigum (the valley of Brushoo) The valley is well watered especially in the lower reaches, there is an extensive cultivated land. Yasen is probaly well seen in late August as the wheat and maize reach to harwest