An Caisteal is a Scottish

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

 mountain situated six kilometres south of the village of Crianlarich

Crianlarich

Crianlarich is a village in the Stirling district and registration county of Perthshire, Scotland, about six miles north-east of the head of Loch Lomond...

 in the Stirling Council area.

Overview

An Caisteal, which qualifies as a Munro

Munro

A Munro is a mountain in Scotland with a height over . They are named after Sir Hugh Munro, 4th Baronet , who produced the first list of such hills, known as Munros Tables, in 1891. A Munro top is a summit over 3,000 ft which is not regarded as a separate mountain...

, is located in a popular area for hill walking within a group of seven Munros and fourteen tops which stand on the eastern side of Glen Falloch in the Loch Lomond and the Trossachs National Park

Loch Lomond and the Trossachs National Park

Loch Lomond and The Trossachs National Park is a national park in Scotland centred on Loch Lomond, and includes several ranges of hills, the Trossachs being the most famous...

. The mountain reaches a height of 995 metres (3,264 feet) and is usually climbed in conjunction with the neighbouring Munro of Beinn a' Chroin

Beinn a' Chroin

Beinn a’ Chroin is a Scottish mountain located six kilometres south of Crianlarich in the Stirling Council area. With a height of 942 metres it qualifies as a Munro.- Overview :...

 to which it is connected by a high col

Mountain pass

A mountain pass is a route through a mountain range or over a ridge. If following the lowest possible route, a pass is locally the highest point on that route...

 to the south east. The mountains name translates from the Gaelic as “the castle” and is believed to refer to the prominent castellated rocks close to the mountain's summit which serve as an easy way of identifying the mountain from a distance.

Geography

An Caisteal is a mainly grassy hill with some rocky outcrops on its higher slopes. The mountain is formed by four ridges which radiate from its summit, the north ridge goes over a series of undulating rocky knolls known as Twistin Hill to reach the subsidiary top of Sròn Gharbh (709 metres) before dropping down to the A82 road

A82 road

The A82 is a trunk road in Scotland. It is the principal route from Lowland Scotland to the western Scottish Highlands, running from Glasgow to Inverness, going by Loch Lomond, Glen Coe and Fort William. It is the second longest primary A-road in Scotland after the A9, which is the other...

 in Glen Falloch. This northern ridge is the most popular route of ascent and Twistin Hill has some curious features on it as it approaches the summit, there are a number of small caves close to the path and a deep cleft cuts into the ridge. The north west ridge also terminates in Glen Falloch after crossing the lesser top of Stob Glas (710 metres), this ridge can be used for ascent but is not as popular as the route over Twistin Hill.

The other two ridges are shorter and link to other mountains with the south west ridge connecting to the Munro of Beinn Chabhair some two kilometres distant and includes a sharp rough descent and ascent over a low col with a height of 619 metres. The south east ridge links to Beinn a' Chroin across the Bealach Buidhe (805 metres) and the headwaters of the River Falloch. Drainage from the mountain reaches both the east and west coast of Scotland, most precipitation goes via the River Falloch and Loch Lomond

Loch Lomond

Loch Lomond is a freshwater Scottish loch, lying on the Highland Boundary Fault. It is the largest lake in Great Britain by surface area. The lake contains many islands, including Inchmurrin, the largest fresh-water island in the British Isles, although the lake itself is smaller than many Irish...

 to reach the Firth of Clyde

Firth of Clyde

The Firth of Clyde forms a large area of coastal water, sheltered from the Atlantic Ocean by the Kintyre peninsula which encloses the outer firth in Argyll and Ayrshire, Scotland. The Kilbrannan Sound is a large arm of the Firth of Clyde, separating the Kintyre Peninsula from the Isle of Arran.At...

 at the west coast, however a small amount drains from the southern slopes to go via Strathyre and the River Teith to reach the Firth of Forth

Firth of Forth

The Firth of Forth is the estuary or firth of Scotland's River Forth, where it flows into the North Sea, between Fife to the north, and West Lothian, the City of Edinburgh and East Lothian to the south...

at the east coast.

Ascents

An Caisteal is usually ascended from Glen Falloch — there is a large lay by for parking on the A82 at grid reference although it is also possible to start from Derrydaroch farm 2.5 kilometres to the south west. The route goes under the railway by a sheep creep and follows a track by the River Falloch upstream for about a kilometre before striking SW to climb Sròn Gharbh direct across pathless grass. A path is then picked up at the summit of Sròn Gharbh which leads across Twistin Hill and past "The Castle" rocks to reach the summit.