There are 497 miles of oceanic coast in Katmai National Park. There are several lakes within Katmai National Preserve but it does not border any salt water. The northern section of Katmai National Park borders on Kamishak Bay and Cook Inlet. The central and southern sections of Katmai National Park border on Cook Inlet and Shelikof Strait. Bays in Katmai include; Swikshak, Hallo, Kukak, Kaflia, Kinak, Amalik, Dakavak, Katmai, and Kashvik. Bear viewing is quite predominant at most of these bays.
The Katmai coast is an area of the Park that is currently experiencing a rapid increase in use and visitation (100% increase in the last 12 years).