The Thracian word arta(s)
Word arta(s)
Meaning river
Synonyms iuras, mar, sara, sind(u)-, strumon

Other words that might be of interest
achel- ‘water’, ala ‘current, stream’, alta ‘current, stream’, arma ‘swamp’, ars ‘to flow’, e(i)b ‘to flow’, kaba(s) ‘bog, swamp’, kalsas ‘dry, dried up’, ostas ‘river mouth’, pala ‘swamp’, opa ‘water’, krisos ‘river name’