Krupa is a river in Slovenia, which originates from the south-east of municipality Semič in the middle of the Karst valley region of Bela krajina. It originates in strong Karst springs under the 30m wall from the thickly stocked lower limestone. After that, it penetrates through a 2 km long intersecting valley to Lahinja, into which it flows below settlement in Gradec.
The spring of Krupa is the only known site of the cave clam (Congeria couscery) in Slovenia, and there are other endemic species of cave snails and the largest cave vertebrate human fish (Proteus anguinus).
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