The wetland site of Järvensuo 1 is located by the southern shore of the overgrown and drained Lake Rautajärvi in Humppila, south-west Finland. The peatland drainage and small-scale wetland excavations have revealed a rare corpus of organic archaeological and palaeoenvironmental remains from prehistory, which have been preserved in moist anoxic conditions on the lake shore. The reporting and publishing of the preliminary excavations in 1985 were left unfinished and, therefore, the character and context of this extraordinary lake site have remained largely undetermined. After 35 years, the available data associated with Järvensuo 1 has finally been compiled and will now be presented in this paper as a whole for the first time. Even though the contexts and circumstances of recovery have been challenging to reconstruct after more than three decades, and the organic artefacts are badly degraded today, the study will offer a long-awaited update about the site and its investigations. The results will also serve as valuable baseline data for the purposes of new multidisciplinary research underway at Järvensuo 1, potentially revealing more elaborate information concerning the site and its prehistoric inhabitants in a dynamic lake environment.