Yanayin lardin Koshi

Lardin Koshi wani fili ne  mai faɗin murabba'in kilomita 25,905 (sq mi 10,002).  Tana kusa da gabashin Nepal yana iyaka da yankin Tibet mai cin gashin kansa na kasar Sin a arewacin lardin Bagmati a yamma, lardin Lardi na 2 a kudu maso yamma, Bihar na Indiya a kudu, Arewacin Bengal na Indiya a kudu maso gabas da Sikkim na Indiya a arewa maso gabas.  Sikkim da wani yanki na Arewacin Bengal na Indiya suna yin alaƙar kabilanci da Nepal.  Geography na Lardin Koshi a gabashin Nepal yana da banbance-banbance, na kololuwar Himalayas a cikin iyakar arewa zuwa yankin terai zuwa kudu.  Ya ta'allaka ne tsakanin 86 digiri 1 minutes da 88 digiri 3 minutes gabas Longitude da 28 digiri 2 minutes da 26 digiri 3 minutes arewa longitude.  Biratnagar, babban birnin masana'antu na Nepal, shine babban birnin wucin gadi na wannan lardin.t

 Yanayin ƙasa 
Lardin Koshi yana da tuddai uku; tsaunuka masu tsawo na arewa, tsaunuka na tsakiya da kudancin terai. Ƙananan ƙasar da ke kewaye da tuddai da aka sani da ciki-terai .

 Yankin Himalayas na Sama 
Higher Himalayas sune sassan arewacin lardin Koshi wanda ke sama da  m (9,800 . Ya ƙunshi yanayin sub-alpine da alpine. Ya ƙunshi gundumomi 3 na Lardin Koshi: Taplejung, Sankhuwasabha da Solukhumbu .

 Yankin Tsakiyar Tuddai 
Yankin tsakiya na tsaunuka ko ƙaramin Himalayas (Pahad) yanki ne na tsakiya tsakanin Himalayas mafi girma da terai na lardin Koshi wanda ke arewacin terai da kudancin himalayas mafi kyau. Har ila yau an san shi da Mahabharat range. Tsawon yankin Mid-hills ya kasance daga 1,000 da 3,000  . Wannan yankin ya ƙunshi gundumomi 8 na Lardin Koshi: Panchthar, Tehrathum, Dhankuta, Bhojpur, Khotang, Okhaldhunga, Ilam da Udayapur .

 Yankin Terai 
Yankin kudancin lardin yana da filayen noma mai kyau wanda ake kira Terai. Tsawon tsaunuka na lardin Koshi ya kasance daga 70 da 1,000  . Yankin terai na lardin Koshi ya ƙunshi gundumomi 3: Jhapa, Morang da Sunsari .

 Yankin Inner-terai 
Yankin ƙasa mai laushi tsakanin tuddai na Shiwalik da tuddai na Mahabharat da aka sani da terai na ciki. Gundumar Udayapur ta Lardin Koshi tana da wani ɓangare na Inner terai . Gundumar Udayapur ta kasance daga 360 da 2,310   sama da matakin teku, don haka 360m zuwa 1000m na yankin tsawo na Gundumar udayapur shine Inner terai.