The Engadine is a high-lying valley in the Canton of the Grisons (Kanton Graubünden) in Switzerland. Its Rhaeto-Romanic (rätoromanisch) names are Engiadina, Nagiadegna and Gidegna - Engadina in Italian - and are variations of the Rhaeto-Romanic for the river Inn (En). It is more than 80km in length and one of the highest inhabited valleys in Europe. The valley is at the uppermost part of the river Inn's rise and is divided into two distinct territories: the Upper Engadine and the Lower Engadine. The boundary between these two areas lies between Cinuous-chel, a sub-district of the municipality of S-chanf, and Brail, a sub-district of the community of Zernez. It's defining landmark is the Punt Ota bridge spanning the mouth of the river Ova da Punt Ota.