I often mention Turnagain Arm here. There are two arms that fork at the upper reaches of Cook Inlet.
One is Turnagain and the other is Knik Arm. Anchorage sits in the web between those those two forks. Turnagain is roughly 40 miles long, snaking along the water's edge. It sees some of the highest tides in the world.
The photo below is from http://www.facebook.com/weloveroadtrips