Sites such as the "Grotto of Baredine" near Poreč, the underground river Pazinčica, and the karst Pazin pit (Pazinska jama) near Pazin are geologic attractions. The Limski Kanal is the only structure resembling a fjord in continental Europe outside of Scandinavia (though actually it is not a fjord, but a ria). The quarry near Rovinj has been designed for studying geology. The longest river, the Mirna is only long and its mouth is near Novigrad. Other rivers that pass through Istria include the "Dragonja River" and the Raša River.