Clear emerald water unspoiled woods and pure untouched nature this is mreznica one of croatias finest and clearest rivers ideal for canoeing and kayaking this typical karst river with numerous travertine waterfalls interspersed with calm water can reach 27 degrees celsius in the summer mreznica is home to many threatened and protected plant and animal species that you may get the chance to observe there are several sections of the mreznica river suitable for kayaking the trip on the