Northern Baltic basin in Scandinavia south to stream Maurine (53°51'N 10°56'E) in southwesternmost corner of Baltic basin (Germany). Lower reaches of streams and rivers and along coast of Sweden, Finland, Russia southwest to Estonia. Danube (except upper tributaries Save and Arges), Elbe, Ems, Weser and Rhône drainages. Tributaries of upper Rhine downriver (northward) to about Mannheim. A few of the uppermost tributaries of River Tevere, Central Italy. Adriatic drainages, from Potenza (Italy) to Zrmanja (Croatia), except Timavo spring (inhabited by C. scaturigo). mtDNA and microsatellite data show that sculpins from the stream Steenputbeek (4°17'N 50°43'E) in Scheldt drainage represent C. gobio, suspected to be introduced. Sculpins reported from Neretva drainage (Bosnia-Herzegovina) probably also belong to C. gobio.