The municipality's name is a combination of the German and Romansh names. Sils im Engadin is the German name while Segl is the Romansh. The coat of arms is Per fess Azure a Sun radiated Or and Or a Trout Azure spotted Gules. It shows a blue upper half with a golden sun and a yellow lower section with a blue trout. It is a combination of the historical village coats of arms and represents the sunny and elevated location of the municipality and the fish-filled Lake Sils.The municipality is located in the Maloja district. It consists of the village of Sils im Engadin/Segl which is made up of the sections of Sils-Maria, Sils-Baselgia, Fex, and Grevasalvas. Until 1943, Sils im Engadin/Segl was known as Sils im Engadin.Located in the Upper Engadin valley, Sils nestles between Lake Sils and Lake Silvaplana at the foot of Piz Corvatsch and Piz da la Margna and below the Fex valley. Sils was originally divided into the two hamlets of Sils-Baselgia and Sils-Maria, but the two now almost form a continuum. The town is in a flat plain between the two lakes, with steep slopes on either side. The plain is cultivated in grass, the steep slopes are heavily forested.