Šventoji - the largest tributary of the Neris River.
Origins - Ignalina, mosses lake., Gražute Regional Park. The
biggest river, which flows through the whole territory of
Lithuania. Basin extends from the northeast to the southwest,
covering laky Zarasai, Utena, Moletai heights (25% of basin area)
and Svedasu Sirvintu plateau (54%) and the lowlands of Central
Lithuania (21%). The river flows through three regional parks:
Gražutes, Sartu and Anykšciu.
Cache is a traditional size rubber box. Coordinates provided are
quite precisely, so it shouldn't be so hard to find it.
FTF please try to make that puzzle which you will find inside
:)