Siyari rural municipality is located in the Rupandehi part of the Rupandehi district. VDCs such as Mainahiya, Harnaiya, Chillihiya, Pachhim Amuwa and Dayanagar, were combined in Siyari rural municipality. The Rural municipality has total area of 66.17 square kilometers and is divided into 7 wards. Tinau river and Omsatiya rural municipality lies in the east of Siyari rural municipality. Similarly, this rural municipality is surrounded by Danab river and Gaidahawa rural municipality in the west, Soddhodhan rural municipality and Tilottama municipality in the north and Mayadevi rural municipality in the south. The geography of this rural municipality includes plan fertile land. Siyari rural municipality has the total population of the municipality is 38466 consisting male population 18549 and female population of 19917 according to the National Population Census of Nepal 2011. There are 6792 households in Siyari rural municipality.
The name of this rural municipality is based on the Siyari River’s name flows from this rural municipality. Other rivers flows within this rural municipality are Tinau, Siyari, Ghaghar&Danab. and lakes like Nandabhauju, Bhagadari, Kalika, Samayayietc lie in this rural municipality. The major portion of occupation contains agriculture and foreign employment. The major castes residing in this rural municipality are Yadav, Tharu, Brahaman, Chhetri, Lodha, Kurmi, Harijan, Musalman etc. Similarly, Dashain, Tihar, Chhatha, Ramnawami, Shivaratri, Maghi, Rakshyabandhan, Ramajan, Eid etc are the most celebrated festivals in this rural municipality. Here, in this rural municipality all the seasonal corps can harvest & grow well. The major corps grows are Paddy, Wheat, Corn, Mustard, Sunflower, Peanuts, Potato etc. In these days people also engaged in harvesting many cash crops like vegetables, mushroom, livestock, etc.
Mr. Ayodhya Tharu and Mrs. Amrita Gurung are the chairman and vice chairman of the Siyari rural municipality. The rural municipality office is situated in Harnaiya, Rupandehi.