Largest Lake Entirely Within One U.S. State: Lake Iliamna, Alaska
Lake Iliamna** in **Alaska** is the largest lake **completely within a single U.S. state**.
📏 The Stats
| Metric | Lake Iliamna |
|---|
| Surface Area | ~2,600 km² (1,000 sq mi) — varies seasonally |
| Length | 124 km (77 mi) |
| Max Depth | 293 m (961 ft) |
| Volume | 115 km³ (28 cu mi) |
| Elevation | 15 m (49 ft) |
| Location | SW Alaska, Lake and Peninsula Borough; 320 km (200 mi) SW of Anchorage |
🏆 Why It Wins
- Lake Superior (82,100 km²) — borders **3 states + Canada**.
- Lake Michigan (58,000 km²) — **only Great Lake entirely in US**, but borders **4 states** (WI, IL, IN, MI).
- Great Salt Lake (UT) — ~4,400 km² (variable); **saline**, not freshwater.
- Lake Okeechobee (FL) — 1,900 km²; 2nd largest *freshwater* lake wholly in one state.
- Lake Pontchartrain (LA) — 1,600 km²; estuarine (brackish).
🐟 Iliamna's Identity
- Sockeye salmon factory: World's largest red salmon run (10–30M/yr) — Bristol Bay fishery.
- Freshwater seals: **Harbor seals** (landlocked population) — one of 5 freshwater seal populations globally.
- Monster legend: "Illie" — 10–30 ft creature (likely sturgeon or seal sightings).
- Access: **No roads.** Floatplane (Iliamna Airport), boat via Kvichak River, or winter ice road.
- Protection: **Lake Clark National Park & Preserve** (north), **Alaska Peninsula NWR** (south). No dams.
🌍 Global Context
Iliamna ≈ **Lake Titicaca** (Peru/Bolivia) in size. **World rank: ~25th** by area. **Largest in Alaska** (Becharof #2).
Alaska holds the title because **it's huge, roadless, and lets its lakes be lakes.** Iliamna is the crown jewel.
Wanderlust World