Landslides and debris flows can travel far from where they begin, damaging communities downhill. Most maps only show where landslides start, not where they might stop. We used the U.S. Geological Survey’s Grfin Tools to map both where landslides start and where they stop, using simple models and limited data. In the Federated States of Micronesia, we used past landslide records and elevation data to test and adjust the tool. The results matched ~85% of field mapped debris flows. This approach is made to hopefully help other regions make useful landslide maps even when little data is available. By using information from just one known landslide or a few past events, makes the Grfin Tools inputs better. The method offers a fast, practical way to identify risk areas and decide where more detailed study is needed.