Semien Achefer or ("North Acheref") is one of the woredas in the Amhara Region of Ethiopia. It is named for the historic district of Achefer, which was first mentioned in the 16th century. Part of the Mirab Gojjam Zone, Achefer is bordered on the south by Debub Acheref, on the west by the Semien Gondar Zone, on the north by Lake Tana, on the east by Bahir Dar Zuria, and on the southeast by Mecha; the Lesser Abay River defines the woreda's eastern boundary. The woreda includes Dek Island. The administrative center is liben; other towns in Semien Achefer include Yesmala,ቁንዝላ ከተማ በባህርዳር ዙሪያ የምትገኝ ከተማ ናት። ይቺ ከተማ በጣም ዉብ የሆነቺ ከተማ ናት ምክንያቱም በጣና የተከበበች ብርቅየ ከተማ ስለሆነች።ስለዚህ በተለያየየ አጋጣሚ ይቺን ከተማ መጣችሁ ጎብኛት ትደሰታላችሁ።የበለጠ መረጃ ከፈለጉ አነዚህን ሰዎች ይጠይቁ መኳንንት፣አማረ፣ጥበቡን እና በተጨማሪ የቁንዝላን ተወላጅ በሙሉ አመሰግናለሁ መኬ ከኢትዮጲያ። chinba.... Semien Achefer was part of former Achefer woreda.
Based on the 2007 national census conducted by the Central Statistical Agency of Ethiopia (CSA), this woreda has a total population of 189,716, of whom 96,856 are men and 92,860 women; 15,583 or 8.21% are urban inhabitants. The majority of the inhabitants practiced Ethiopian Orthodox Christianity, with 99.05% reporting that as their religion.
Achefer was one of the 105 woredas in the Amhara Region of Ethiopia. It was named for the historic district of Achefer, which was first mentioned in the 16th century. Part of the Mirab Gojjam Zone, Achefer was bordered on the south by the Agew Awi Zone, on the west by the Semien Gondar Zone, on the north by Lake Tana, on the northeast by Bahir Dar Zuria, and on the southeast by Merawi; the Lesser Abay River defined the woreda's eastern boundary. The woreda included Dek Island. The administrative center was Yesmala; other towns in Achefer included Durbete, Kunzela, Chiba and Wandege. Acheref was divided for Debub Achefer and Semien Achefer woredas.
Based on figures published by the Central Statistical Agency in 2005, this woreda has an estimated total population of 326,195, of whom 160,763 are men and 165,432 are women; 24,565 or 7.53% of its population are urban dwellers, which is about the same as the Zone average of 7.6%. With an estimated area of 2,515.64 square kilometers, Achefer has an estimated population density of 129.7 people per square kilometer, which is less than the Zone average of 174.47.