A long brooding pool with a depth of about 12 ft, Floutern Tarn drains east and then north into the morass of Mosedale. A walker's pass, Floutern Tarn Pass, crosses beside Floutern, providing access from Buttermere to Ennerdale. The western side follows Gill Beck, the southern boundary of Gavel Fell.
A deep contemplative lake, approximately 12 ft in depth, Floutern Tarn drains east and north into the vast bog of Mosedale. A pedestrian passage, Floutern Tarn Pass, lies adjacent to Floutern, offering access from Buttermere to Ennerdale. The western edge follows Gill Beck, the southern border of Gavel Fell.