The border river Mara (Lithuanian), Marycha
(Polish) or Maricha (Russian) is one of the side river of Nemunas. It is running
along the Lithuanian border for about 25 kilometres.
BYLTPL trifinium is wet and in the middle of this river and straight ahead of
the Lithuanian border marker no. 1789. The river is running from left towards
right, and was less than one metre deep.