River Gradac
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The canyon of the river Gradac, (also a name of a suburb in Valjevo) whose course, with almost untouched nature, ends in the town centre, is a favourite picnic area of Valjevo citizens during hot summer days. The Gradac is one of the cleanest European rivers, which is evidenced by the presence of otters, which exclusively inhabit clean waters. It abounds in brook trout, so it is a haven for fly angling fans. Old water mills are one of the symbols of this natural reserve of 13 square kilometres, which has been entrusted by the Valjevo Municipal Assembly to the Gradac Ecological Society. It might become a national park in the near future.