Kampa is an island cut from Malá Strana by the Čertovka, a millstream narrow enough to step across, with two wooden water wheels still turning against the house walls. The channel was dug in the Middle Ages to drive those mills. The island behind it was gardens and a pottery market, and the pottery market still returns once a year. Floods have swept across it repeatedly, worst in 2002, when the water reached the first-floor windows, and again in 2013. Today it is a park of plane trees and lawns directly beneath Charles Bridge, with the Kampa Museum of modern art at the southern, upstream end.
The rest of the story is the river itself. Eighteen bridges cross the Vltava inside Prague, and the embankments below them have become the city's outdoor room: concrete steps upstream at Náplavka where boats are moored as bars, a Saturday farmers' market, swans working the shallows, and joggers running the bank all the way up to Vyšehrad. On Kampa's grass the great stone arches are directly overhead, and at dawn the mist comes off the water while the castle picks up the first light.