Glen

Key takeaways

Glen belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Glen to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Glen from memory before moving on to harder problems.

Reference excerpt

A glen is a valley, typically one that is long and bounded by gently sloped concave sides, unlike a ravine, which is deep and bounded by steep slopes.

Etymology

The word is Goidelic in origin: gleann in Irish and Scottish Gaelic, glion in Manx. The designation "glen" also occurs often in place names. In Manx, glan is also to be found meaning glen. It is cognate with Welsh glyn. Whittow defines it as a "Scottish term for a deep valley in the Highlands" that is "narrower than a strath". Examples in Northern England, such as Glenridding, Westmorland, or Glendue, near Haltwhistle, Northumberland, are thought to derive from the aforementioned Cumbric cognate, or another Brythonic equivalent. This likely underlies some examples in Southern Scotland. As the name of a river, it is thought to derive from the Irish word glan meaning clean, or the Welsh word gleindid meaning purity. An example is the Glens of Antrim in Northern Ireland where nine glens radiate out from the Antrim plateau to the sea along the coast between Ballycastle and Larne.

Places

The designation "glen" also occurs often in place names such as Great Glen and Glenrothes in Scotland; Glendalough, Glenswilly, Glen of Aherlow, Glen of Imaal and the Glens of Antrim in Northern Ireland; Glenn Norman in Canada; Glendale, Glen Ellen and Klamath Glen in California, Glenview and Homer Glen in Illinois, and Glenrock in Wyoming; Glenview, Glen Waverley, Glen Eira, Glengowrie, Glen Huntly and Glen Forrest in Australia; and Glenorchy, Glendowie, Glen Eden, Glenledi, Glenomaru, Glen Massey, Glen Murray, Glenleith, Glendhu Bay, Glenbrook, and Glen Innes in New Zealand. In the Finger Lakes region of New York State, the southern ends of Seneca Lake and Cayuga Lake in particular are etched with glens, although in this region the term "glen" refers most frequently to a narrow gorge, as opposed to a wider valley or strath. The steep hills surrounding these lakes are filled with loose shale from glacial moraines. This material has eroded over the past 10,000 years to produce rocky glens (e.g., Watkins Glen, Fillmore Glen State Park and Treman State Parks) and waterfalls (e.g., Taughannock Falls) as rainwater has flowed down toward the lakes below.

Scotland Many place-names in Scotland with "glen" derive from the Gaelic gleann ("deep valley"), with some being from the cognates in the Brittonic languages Cumbric and Pictish or from the Gaelic loanword glen in Scots.

Glenalmond, Perthshire Glen Affric, Inverness-shire Glenbarton, Dumfriesshire - from Gaelic *gleann-Breatann, or else Brittonic glyn-Brython ("Briton valley"). Glencairn, Dumfriesshire Glen Coe, Argyll Glencortas, Fife - from Gaelic gleann + possibly coirthe ("standing stone") + as (locational suffix). Glendevon, Perthshire Glendevon, Lanarkshire Glendivan, Dumfriesshire Glendow, Dumfriesshire - from Middle Irish glenn-dubh or Brittonic glyn-du ("dark valley"). Glen Doll, Perthshire Glenduckie, Fife - from Gaelic gleann + possibly duaigh ("evil") + -in (suffix). Glen Etive, Argyll Glengaber, Dumfriesshire Glenkens, Kirkcudbrightshire - Brittonic glyn + Ken (river name). Glenlochar, Kirkcudbrightshire Glen Ogle, Perthshire Glenrothes, Fife - from Scots glen + Rothes. Glensax, Peeblesshire Glensaxon, Dumfriesshire Glen Shiel, Ross and Cromarty Glentanner, Selkirkshire Glentenmont, Dumfriesshire Glenturk, Wigtownshire Glenturret, Perthshire Glen Vale, Fife - from Gaelic gleann-a’-bhealaich ("glen of the pass").

England Some place-names in England contain the element "Glen". Many of these are derived from Brittonic cognates of Gaelic gleann (Welsh glyn).

Glencoyne, Cumberland - Brittonic glyn or Middle Irish glenn + possibly a river name. Glendinning, Cumberland - Brittonic glyn or Middle Irish glen + Brittonic din ("fort") + an/in (suffix). Glendon, Devon - possibly a hybrid of Cornish glyn and Old English dun ("hill"). Glendowlin, Westmorland - Brittonic glyn or Middle Irish glenn + earlier Brittonic du ("black") + llyn ("pool"). Glendue, Northumberland Glendurgan, Cornwall - from Cornish glynn ("deep valley") + dowrgeun ("otters"). Glenridding, Westmorland - equivalent to Old Welsh glinnredin ("bracken valley"). Glyn Morlas, Shropshire Glynn Kenyel, Cornwall - from Cornish glynn ("deep valley") + ken ("meeting, confluence") + yel (adjectival suffix). Note that some place-names in England with "Glen", such as Glen Parva in Leicestershire, are actually more likely to derive from river-names named with Brittonic glan ("shining").

Wales Some place-names in Wales contain the element glyn ("valley").

Emlyn, Pembrokeshire, from am-glyn ("at the valley") Glynceiriog, Denbighshire Glyncorrwg, Glamorgan Glynneath, Glamorgan Glynrhonwy, Caernarfonshire Glyn Tarell, Brecknockshire

Isle of Man Glen Maye, Glenfaba Glen Wyllin, Kirk Michael Silverdale Glen, Malhew Tholt-y-Will Glen, Lezayre - also known as Sulby Glen

See also High valley – Valley in the upper third of a mountain range Strath – Large valley Dale (landform)

References

Illustrations

Worked examples

Example 1 — a first encounter with Glen

Start with the simplest possible case. Write down what Glen claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Glen before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Glen ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Glen

In research: Glen appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Glen in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Glen is common in secondary-school and first-year university syllabi. It links to neighbouring topics Glens, Landforms, Slope landforms, so understanding it makes those chapters shorter.
In everyday life: Look for Glen outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Glen in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Glen means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Glen out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Glen in simple terms?

A glen is a valley, typically one that is long and bounded by gently sloped concave sides, unlike a ravine, which is deep and bounded by steep slopes. Etymology The word is Goidelic in origin: gleann in Irish and Scottish Gaelic, glion in Manx.

Why does Glen matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Glen?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Glen.