The Bednja (Croatian pronunciation: [bêdɲa]) is a river in northern Croatia, a right tributary of the Drava.

[1] The Bednja rises in the mountainous forested areas near Macelj in northern Croatia, west of Trakošćan, where it also forms a 0.2 km2 (0.077 sq mi) lake at 255 m.a.s.l.

[1] It flows towards the southeast until turning east near the village of Bednja, meandering south at Novi Marof, returning to its eastward course shortly thereafter, and then turning northeast toward Ludbreg.

The name "Serapia" is supposed to come from Proto-Indo-European words *ser (to flow) and *h2ep (water).

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