flows NE to Niukluk River, 31 mi. NE of Solomon, Seward Peninsula High. 32 miles long.
Eskimo name published in January 1900 as "Casa-de-Parga (or Kosoktok Creek)" by Schrader (1900 c, p. 16), U.S. Geological Survey (USGS).
Mount Bendeleben, Bermudez Bluff, Mount Dixon,
Rivers:Casadepaga River, Libby River, West Fork Libby River,
Streams:Alice Creek, Alma Creek, American Creek, Auburn Creek, Bennett Creek, Betsy Creek, Big Four Creek, Birch Creek, Bonanza Creek, Brownie Creek, Camp Creek, Castle Creek, Cliff Creek, Conway Creek, Davison Creek, Dawson Creek, Discovery Creek, Dixon Creek, Dry Creek, Elkhorn Creek, Eureka Creek, Fool Creek, Foster Creek, Gold Run Creek, Goldbottom Creek, Hash Creek, Helena Creek, Howard Creek, Iron Creek, Ivanhoe Creek, Kingsley Creek, Lightning Creek, Little Dixie Creek, Mason Creek, McBann Creek, Military Creek, Moonshine Creek, Mud Creek, Nesbit Creek, No Mans Creek, Nugget Creek, Penelope Creek, Post Creek, Puckmummie Creek, Quartz Creek, Rock Creek, Shea Creek, Spruce Creek, Steward Creek, Sunnyside Creek, Surprise Creek, Thrope Creek, Ventura Creek, Warm Creek, Watson Creek, West Fork Libby Creek, Woods Willow Creek,
Valleys: