Union Bay Natural Area

tags: Seattle Washington, Montlake Fill, Union Bay Natural Area, urban wetland, urban nature preserve, University of Washington Entrance to the Union Bay Natural Area (UBNA), more commonly known as the "Montlake Fill". Image: GrrlScientist 29 September 2008 [larger view]. One of my most favorite places to go birding is the Union Bay Natural Area (UBNA), which I have always known as the Montlake Fill. In my opinion, this is one of the finest small- to medium-sized urban birding areas and nature preserves on the west coast. This area originally started out as a freshwater wetland, but the…