How do you get the Silverlight key stuck in the drain?

The key is on top of a pile of mud near a clump of several skeletons. There is a river near the area of the key in which the monsters are on the other side. When the mouse is moved over the key, "Take rusty key" appears in the corner of the screen.

NOTE: The key does not appear as a red dot item on the mini map. HINT:The key sparkles every other second. hope you liked my answer recommend me please.