The Pazinčica or Pazinski potok (Italian: Foiba, Fojba), locally Potȍk or Patȍk, is a river in the central part of the Istrian peninsula, Croatia.

It flows 18 kilometres (11 mi) above ground before entering its ponor, the Pazinska jama [hr], continuing as a subterranean river.

[1] From its source near Borut to its ponor in Pazin, it has only a few constant tributaries: the Brestovica, Toplica, Lipa, Rakov potok and Frnežar.

The course of the river was then diverted from a northward to a southward direction where, at the contact between flysch and limestone, a ponor was formed.

[2] The springs in the Raša valley in question are Sveti Anton, Rakonek, Grdak and Sušaki.