# Gillis Slough

> tributary to Grays Harbor in Grays Harbor County, Washington, United States

**Wikidata**: [Q106405340](https://www.wikidata.org/wiki/Q106405340)  
**Source**: https://4ort.xyz/entity/gillis-slough


## References

1. Geographic Names Information System
2. OpenStreetMap
3. National Hydrography Dataset
4. GeoNames
5. National Elevation Dataset