Helen Lake is located in Glacier National Park, in the U. S. state of Montana

Montana

Montana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...

. Helen Lake is at the head of the Belly River

Belly River

Belly River is a river in northwest Montana, United States and southern Alberta, Canada. It is a tributary of the Oldman River, itself a tributary of the South Saskatchewan River....

 and is situated below Ahern Peak

Ahern Peak

Ahern Peak is located in the Lewis Range, Glacier National Park in the U.S. state of Montana. The mountain was named after George Patrick Ahern. Ahern Peak is immediately southwest of Helen Lake and straddles the Continental Divide. Ahern Glacier lies just north of the peak....

 to the west and Ipasha Peak

Ipasha Peak

Ipasha Peak is located in the Lewis Range, Glacier National Park in the U.S. state of Montana. Ipasha Peak is south of Mount Merritt and is in the northeastern section of Glacier National Park. Ahern Glacier is located on the southeastern slopes of the mountain while the Ipasha Glacier is to the...

 to the northwest. Numerous small streams feed the lake in addition to melt waters from the Ahern Glacier

Ahern Glacier (Montana)

Ahern Glacier is located in the U.S. state of Montana in Glacier National Park. The glacier was named after George Patrick Ahern. Ahern Glacier is situated on a ridge between Ipasha Peak to the north and Ahern Peak to the south at an elevation between and above sea level...

 which descend 1680 feet (512.1 m) over Ahern Glacier Falls in one sheer drop to a talus slope below in route to the lake.