The municipality is located in the Trin sub-district, of the Imboden district.
Flims is located on a terrace north of the Rhine valley, forming the Ruinaulta gorge here. The country-side has numerous streams and lakes north of the village, from which the name derives; "fluminae" in Latin means "many streams". The main river is called Flem while Caumasee and Crestasee to the south of the town do not have tributaries for lying in the debris area of prehistoric Flims Rockslide, where the landscape is very rough and completely forested as there was no agriculture possible ever.
The lowest point of the municipality is at the Rhine river in the Ruinaulta at 630 meters, while Piz Segnas reaches 3099 m. Both Piz Segnas and neighbouring Piz Dolf show the line of the Glarus thrust in its upper part, now a UNESCO world heritage. The easiest access to the area is an aerial cableway to Fil de Cassons from Flims or any of various hikes to this ridge lying southeast of Piz Dolf. One route uses the ascent via Val Bargis, a wild valley running around Flimserstein.
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