Unit 21D, Alaska

Lowland boreal taiga and spruce-birch-aspen forest dominating the Koyukuk River floodplain; extensive wetlands, oxbow lakes, and over 15,000 lakes; rolling low mountains on unit margins; unique Nogahabara Sand Dunes (6-mile active dune field) within the Koyukuk NWR portion; elevations range roughly 100–3,600 ft; no roads penetrate the unit interior

Entirely roadless — access by floatplane (charter operators based in Fairbanks or Galena) or jet/prop boat on the Koyukuk River and major tributaries; jet boats strongly recommended for tributaries; float hunting via canoe/kayak/raft also practiced; nearest hubs are Galena (~270 miles west of Fairbanks) and Hughes; public lands include Koyukuk National Wildlife Refuge (3.5 million acres, USFWS), BLM Central Yukon Field Office lands along the South Fork Koyukuk, and state public domain; estimated 90–95% public land

Lowland boreal forest (white spruce, black spruce, paper birch, quaking aspen) interspersed with extensive wetlands, sedge meadows, willow/alder riparian shrub, and open tundra on upland slopes; river floodplains provide dense willow and shrub communities — prime moose browse; active sand dunes (Nogahabara) represent a rare desert microhabitat

Western Arctic Caribou Herd (WACH) — the primary caribou herd influencing the unit — migrates across northwestern and interior Alaska; population estimated at ~164,000 in 2022 (lowest in 40 years, down from ~500,000 peak in early 2000s); herd winters periodically in the Iniakuk Lake and North Fork Koyukuk drainage, though occurrence varies by year; moose densities can reach 5+ per square mile in prime Three-Day Slough and Koyukuk floodplain habitats; brown bears, black bears, wolves, and wolverines present year-round; up to 100,000 ducks hatched seasonally on refuge wetlands

SUBSISTENCE PRIORITY: Unit 21D is within Alaska's subsistence priority framework; federally qualified rural residents hold priority for subsistence harvest of moose and caribou on federal public lands within Koyukuk NWR; ADF&G state subsistence preference applies on all lands. NON-RESIDENT RESTRICTIONS: Non-residents have NO open season for moose in Unit 21D (Registration Hunt RM834 is Alaska residents only); non-residents must complete the ADF&G Nonresident Moose Hunter Orientation before hunting moose anywhere in Alaska; nonresident aliens must be accompanied by a licensed Alaska guide for all big game; proxy hunting moose in Units 21B, 21C, 21D, and 24 is prohibited if either party holds a drawing permit. KOYUKUK CONTROLLED USE AREA (KCUA): Covers a large portion of Units 21 and 24; prohibits use of aircraft for moose hunting including transport of hunters and gear — exceptions only for travel between publicly owned airports or transport of processed meat; mandatory check stations on the Koyukuk River; moose meat must remain on the bone until transported out of the area. MUSKOX: Drawing permit hunts available in Unit 21D with $500 nonresident drawing fee; guide required for nonresident aliens. BEAR/WOLF: General season applies; residents may hunt black bear and wolf without a guide; nonresidents require guide for brown/grizzly bear.