Cook Inlet stretches 180 miles (290 km) from the Gulf of Alaska to Anchorage in south-central Alaska. Cook Inlet branches into the Knik Arm and Turnagain Arm at its northern end, almost surrounding Anchorage. On its southern end, it merges with Shelikof Strait, Stevenson Entrance, Kennedy Entrance and Chugach Passage.
The navigational light at the southwestern tip of Elizabeth Island demarcates the boundary between Cook Inlet and the Gulf of Alaska
Image: Wpdms shdrlfi 020l cook inlet with arms
Cook Inlet seen from Clam Gulch
Turnagain Arm
The Gulf of Alaska is an arm of the Pacific Ocean defined by the curve of the southern coast of Alaska, stretching from the Alaska Peninsula and Kodiak Island in the west to the Alexander Archipelago in the east, where Glacier Bay and the Inside Passage are found.
A view of the Gulf of Alaska from space, showing swirling sediment in the waters