Gelgia (Romansh, German: Julia) is a river in the Grisons canton, eastern Switzerland. It is a tributary of the Albula, which it meets in Tiefencastel. The road to the Julier Pass runs through the Sursés (German: Oberhalbstein), like the major valley of the Gelgia and its side valleys are called.

Gelgia
Piz Platta (3392m a.s.l.) in the south-west as seen from Sur
Map
Location
CountrySwitzerland
Physical characteristics
MouthAlbula
 • coordinates
46°39′45″N 9°34′23″E / 46.6626°N 9.5730°E / 46.6626; 9.5730
Basin features
ProgressionAlbulaHinterrheinRhineNorth Sea