# Piirioja

> river in Estonia and Latvia, tributary of Väike Emajõgi

**Wikidata**: [Q26000857](https://www.wikidata.org/wiki/Q26000857)  
**Source**: https://4ort.xyz/entity/piirioja


## References

1. Estonian Environmental Register
2. [Source](http://vietvardi.lgia.gov.lv/vv/mv_lgiamap5n?p_x=619723&p_y=413539&p_id=95068&p_river=true)
3. Estonian Nature Information System