Ecology-based myths might refer to environment-based expressions that can be used as a vehicle to be close to the local environment and Karo people are rich of such expressions. This study is aimed at making an inventory of myths in Juhar Subdistrict, Karo Regency and at classifying them. The approach of literary ecology and the concept of myth are used in this paper. The ecological studies of literary works meet the ecology with literary works so the ecological paradigm of literary studies are meant to apply the ecological approach to literary works appreciation. The research methods are qualitative and inventory as well as the use of noting, recording, and interviewing techniques. The results show that there are ten ecological myths which are classified into the myths of soil and stone, plants and animals, and magical creatures.