- Humptulips-Grass Creek Wildlife Area Unit (wdfw.wa.gov)
The Humptulips-Grass Creek Unit is located in North Bay at the confluence of the Humptulips River, Grass Creek, and Grays Harbor. No maintained trails exist, and the best access is by boat or by the adventuring brush buster. This area is a popular waterfowl hunting and fishing site and has excellent birding opportunities. The unit is managed for tidal channel and estuary preservation in North Bay, salmon recovery, and waterfowl habitat.
- Quadrilateral (Wikipedia)
In geometry a quadrilateral is a four-sided polygon, having four edges (sides) and four corners (vertices). The word is derived from the Latin words quadri, a variant of four, and latus, meaning “side”. It is also called a tetragon, derived from greek “tetra” meaning “four” and “gon” meaning “corner” or “angle”, in analogy to other polygons (e.g. pentagon). Since “gon” means “angle”, it is analogously called a quadrangle, or 4-angle. A quadrilateral with vertices A, B, C and D is sometimes denoted as ABCD.