This is the 1610th most frequent Korean word.
물에
"물에" means "in water" or "on water" in English.
'물에' specifies the location (water) where the action (dropping) occurred.
물에 사진을 빠뜨렸어요.
I dropped the photo into the water.
'물에' describes where the subject (the turtle) is located, emphasizing position.
물에 있다는 거북이를 찾아보세요.
Look for the turtle, as it is in the water.
'물에' indicates the surface (of water) supporting the state of floating, linking the context of floating to the location.