The muted green sign among the native grasses invites golfers into Whistling Straits. Just ahead the raised bunkers that dot the hill to the clubhouse look less hospitable.

While the most prominent feature on display this week at the 2010 PGA Championship will be the wind-swept views with Lake Michigan glistening in the background, all the sand will likely torment the pros.

The number of bunkers at architect Pete Dye's 1998 creation isn't known.

A recent Golf Digest article counted 967. The fact sheet handed out by the Golf Course Superintendents Association of America lists the details of the types of grass, water sources, green sizes and soil mix.

As for bunkers? "Numerous."