is located in the Moutier district in the Petit Val. The main village is split in half by the Pichoux-Strasse. It consists of the villages of Châtelat, Moron and Fornet-Dessous. The nearby village of Fornet-Dessus belongs to the municipality of Lajoux. On 31 December 2009 District de Moutier, the municipality's former district, was dissolved. On the following day, 1 January 2010, it joined the newly created Arrondissement administratif Jura bernois. Coat of arms The blazon of the municipal coat of arms is Argent a Tower embattled Sable issuant from a Mount of 3 Coupeaux Vert between three Mullets Gules. The coat of arms of Châtelat is an example of canting since the tower is a castle (). The threes stars represent the three parts of the municipality, le Châtelat, le Fornet and Moron. Demographics Châtelat had a population (as of 2013) of 105. , 2.7% of the population are resident foreign nationals. Over the last 10 years (2001-2011) the population has changed at a rate of 0%. Migration accounted for -3.6%, while births and deaths accounted for 0%. Most of the population () speaks German (78 or 63.9%) as their first language with the rest speaking French. , the population was 50.5% male and 49.5% female. The population was made up of 55 Swiss men (49.5% of the population) and 1 (0.9%) non-Swiss men. There were 53 Swiss women (47.7%) and 2 (1.8%) non-Swiss women. Of the population in the municipality, 71 or about 58.2% were born in Châtelat and lived there in 2000. There were 31 or 25.4% who were born in the same canton, while 14 or 11.5% were born somewhere else in Switzerland, and 3 or 2.5% were born outside of Switzerland. , children and teenagers (0–19 years old) make up 27% of the population, while adults (20–64 years old) make up 49.5% and seniors (over 64 years old) make up 23.4%. , there were 52 people who were single and never married in the municipality. There were 65 married individuals, 5 widows or widowers and individuals who are divorced. , there were 9 households that consist of only one person and 6 households with five or more people. , a total of 39 apartments (84.8% of the total) were permanently occupied, while 5 apartments (10.9%) were seasonally occupied and 2 apartments (4.3%) were empty. The vacancy rate for the municipality, , was 2%. The historical population