Yes... swamps and such like are the best for preserving degradeable matter. Peat Bogs are the best.
This man was found in a peat bog... he dates to 400BC.
The Tollund Man is the naturally mummified corpse of a man who lived during the 4th century BC, during the time period characterised in Scandinavia as the Pre-Roman Iron Age.<sup id="cite_ref-pbs1_0-0" class="reference"> </sup> He was found in 1950 buried in a peat bog on the Jutland Peninsula in Denmark, which preserved his body. Such a find is known as a bog body.<sup id="cite_ref-bog_1-0" class="reference"> </sup>The head and face were so well-preserved that he was mistaken at the time of discovery for a recent murder victim.<sup id="cite_ref-lib_2-0" class="reference"></sup>