The Krapina is a Croatian river flowing through Krapina-Zagorje County and Zagreb County. It is a tributary to the Sava. The confluence of the Krapina River and the Sava River is near Zaprešić. The Krapina's length is 66.9 km (41.6 mi) and its basin covers an area of 1,237 km² (478 sq mi).^[2][1]

Krapina
River Krapina near Zaprešić
Location
Country	Croatia
Physical characteristics
Mouth
• location	Sava
• coordinates	45°49′39″N 15°49′24″E / 45.8274°N 15.8234°E / 45.8274; 15.8234
Length	66.9 km (41.6 mi) [1]
Basin size	1,237 km2 (478 sq mi) [1]
Basin features
Progression	Sava→ Danube→ Black Sea

The hydrological parameters of Krapina are regularly monitored in Croatia at Zlatar Bistrica, Bračak and Kupljenovo.^[3]

The name "Krapina" is supposed to come from Latin word "carpinus" (of the carp). Another theory is that it comes from Proto-Indo-European *(s)ker (to cut) and *h2ep (water), meaning "the water that cuts through the valley".^{[4][unreliable source]}