Słupia
Słupia is a river in north-western Poland , a tributary of the Baltic Sea , with a length of 138 kilometres and the basin area of 1 , 623 km² . 
<triplet> Słupia <subj> Poland <obj> country <subj> Baltic Sea <obj> mouth of the watercourse <triplet> Poland <subj> Baltic Sea <obj> located in or next to body of water <triplet> Baltic Sea <subj> Poland <obj> basin country