City of Soldotna, Alaska - Photo Welcome to Soldotna highway sign Northern Limits. The City of Soldotna is home of the World Record King Salmon 94.4 lbs. - Soldotna took its name from the existing Soldotna Creek that empties into the Kenai River. The Kenai River is one of Soldotna’s big attractions. The Kenai is an 80 mile long river stretching from Kenai Lake in Cooper Landing, Alaska, to the mouth at Cook Inlet near the town of Kenai.