Estrées-Mons  Estrées-Mons is a commune in the Somme department in Hauts-de-France in northern France. The municipality was formed in 1973 from the merger of Estrées-en-Chaussée and Mons-en-Chaussée. It is one of many villages in the north of France bearing the name "Estrées". The etymology of the name is from "strata" (cognate of English "street"), the word for the stone-layered Roman roads in the area (some of which turned into modern highways). Hence "Estreti", "village on the road" which developed into "Estrées". The commune is situated on the N29 road, west-northwest of Saint Quentin.