Hydronyms present a complicated picture; the term for "sea" ("det") is native and an "Albano-Germanic" innovation referring to the concept of depth, but a large amount of maritime vocabulary is loaned. Words referring to large streams and their banks tend to be loans, but "lumë" ("river") is native, as is "rrymë" (the flow of river water). Words for smaller streams and stagnant pools of water are more often native, but the word for "pond", "pellg" is in fact a semantically shifted descendant of the old Greek word for "high sea", suggesting a change in location after Greek contact. Albanian has maintained since Proto-Indo-European a specific term referring to a riverside forest ("gjazë"), as well as its words for marshes. Curiously, Albanian has maintained native terms for "whirlpool", "water pit" and (aquatic) "deep place", leading Orel to speculate that the Albanian Urheimat likely had an excess of dangerous whirlpools and depths. However, all the words relating to seamanship appear to be loans.