Krčić je desetak kilometara dugačka krška riječica, prva pritoka Krke koja završava svoj kratki vodeni tok ulaskom u Kninsko polje. Tamo se prelijeva preko poznatog, 22m visokog slapa, kojeg nazivaju trima imenima: Topoljski buk, Slap Krčić ili Veliki buk. Svojevrstan je to prirodni fenomen, da je ušće neke rijeke u obliku slapa i da završava, odnosno da je povezan sa samim izvorom neke druge. Sam izvor Krke je nepresušan dok za vrijeme sušnog razdoblja u Krčiću nema vode. Izvorišta Krčića nalaze se u jakim krškim vrelima na južnim padinama Dinare a zbog čega je njegov tok najjači u prolječu kad se topi snijeg u planinama.
Krčić is ten kilometers long little karst river, the first tributary of Krka ending its short water flow when entering the Kninsko polje. There it spills into the Krka river in the form of the famous, 22m high waterfall, which has three names: Topoljski buk, waterfall Krčić or Veliki Buk. It is a kind of natural phenomenon, as the mouth of the river is a waterfall and ends at the very source of another river. The Krka's Spring never dries out, while on the other hand during the dry season there is no water in Krčič. Krčić is born in strong karst springs on the southern slopes of Dinara and its flow is strongest in spring when the snow is melting on the mountains.
Kutija se nalazi iznad tunela, s ljeve strane slapa. U razdoblju kad je u slapu puno vode morate proći kroz maglicu što ju je prilikom pada stvara slap. U toplim danima je osvježujuće, u hladnim preporučujemo kabanicu. Pazite, može biti jako sklizko.
The box is placed above the tunel, on the left side of the waterfall. In periods of abundant waters you have to pass through the mist which is formed by the falling water. On warm days it´s refreshing, on colder days we recommend wearing a raincoat. Watch out, the ground might be slippery.