Glen (noun)

1. A narrow valley, especially one that is long and glacially formed.
2. A secluded valley or a small, narrow, secluded valley, often with a stream running through it.

Origin:

From scottish and irish gaelic gleann, from old irish glend, from proto-celtic *glendos ("valley"), from proto-indo-european *ghel- ("to shine, glea.m")

Examples:

1. They hiked through the glen, admiring the beautiful scenery.
2. The glen was surrounded by tall, misty mountains.
3. The glen was a peaceful place, with a stream running through it.
4. He loved to go fishing in the glen.
5. The glen was a popular spot for picnics.