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"Scotland" comes from Scoti, the Latin name for the Gaels. The name is really a misnomer because the land was originally inhabited by Picts and was generally known to the English as Caledonia. The Scots, led by the Campbells - invaders from Northern Ireland, settled in the early centuries AD along the Hebridean coastline and the mountains physically kept them apart from the Picts in Eastern Scotland. In fact, the Late Latin word Scotia ("land of the Gaels") was initially used to refer to Ireland, not Scotland.
By the 11th century at the latest, Scotia was being used to refer to (Gaelic-speaking) Scotland north of the river Forth, alongside Albania or Albany, both derived from the Gaelic Alba. The use of the words Scots and Scotland to encompass all of what is now Scotland became common in the Late Middle Ages.
The mainland of Scotland comprises the northern third of the land mass of the island of Great Britain, which lies off the north-west coast of Continental Europe. The total area is 78,772 km² (30,414 sq mi), comparable to the size of the Czech Republic. Scotland's only land border is with England, and runs for 96 kilometres (60 mi) between the basin of the River Tweed on the east coast and the Solway Firth in the west.
The Atlantic Ocean borders the west coast and the North Sea is to the east.
The island of Ireland lies only 30 kilometres (19 mi) from the south-western peninsula of Kintyre; Norway is 305 kilometres (190 mi) to the east and the Faroes, 270 kilometres (168 mi) to the north.
The territorial extent of Scotland is generally that established by the 1237 Treaty of York between Scotland and the Kingdom of England and the 1266 Treaty of Perth between Scotland and Norway. Important exceptions include the Isle of Man, which having been lost to England in the 14th century is now a crown dependency outside of the United Kingdom; the island groups Orkney and Shetland, which were acquired from Norway in 1472; and Berwick-upon-Tweed, lost to England in 1482.
The geographical centre of Scotland lies a few miles from the village of Newtonmore in Badenoch. Rising to 1,344 metres (4,409 ft) above sea level, Scotland's highest point is the summit of Ben Nevis (Latin-Snowy Point), in Lochaber, while Scotland's longest river, the River Tay, flows for a distance of 190 kilometres (118 mi).
The whole of Scotland was covered by ice sheets during the Pleistocene ice ages and the landscape is much affected by glaciation. From a geological perspective the country has three main sub-divisions.
The Highlands and Islands lie to the north and west of the Highland Boundary Fault, which runs from Arran to Stonehaven. This part of Scotland largely comprises ancient rocks from the Cambrian and Precambrian, which were uplifted during the later Caledonian Orogeny. It is interspersed with igneous intrusions of a more recent age, remnants of which formed mountain massifs such as the Cairngorms and Skye Cuillins.
A significant exception to the above are the fossil-bearing beds of Old Red Sandstones found principally along the Moray Firth coast. The Highlands are generally mountainous and the highest elevations in the British Isles are found here. Scotland has over 790 islands divided into four main groups: Shetland, Orkney, and the Inner Hebrides and Outer Hebrides. There are numerous bodies of freshwater including Loch Lomond and Loch Ness. Some parts of the coastline consist of machair, a low lying dune pasture land.
The Central Lowlands is a rift valley mainly comprising Paleozoic formations. Many of these sediments have economic significance for it is here that the coal and iron bearing rocks that fuelled Scotland's industrial revolution are found. This area has also experienced intense volcanism, Arthur's Seat in Edinburgh being the remnant of a once much larger volcano. This area is relatively low-lying, although even here hills such as the Ochils and Campsie Fells are rarely far from view.
The Southern Uplands are a range of hills almost 200 kilometres (124 mi) long, interspersed with broad valleys. They lie south of a second fault line (the Southern Uplands fault) that runs from Girvan to Dunbar. The geological foundations largely comprise Silurian deposits laid down some 4–500 million years ago. The high point of the Southern Uplands is Merrick with an elevation of 843 m (2,766 ft). The Southern Uplands is home to the UK's highest village, Wanlockhead (430 m or 1,411 ft above sea level).
NB. There have been many ways of dividing up Scotland, physically and politically. I have simply ignored these to some extent and have used the generally-accepted tourism demarcations.