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, the remnants of which have 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 to be 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/1,411 ft above sea level).

The climate of Scotland is temperate and oceanic, and tends to be very changeable. It is warmed by the Gulf Stream from the Atlantic, and as such has much milder winters (but cooler, wetter summers) than areas on similar latitudes, for example Labrador, Canada, Moscow, or the Kamchatka Peninsula on the opposite side of Eurasia. However, temperatures are generally lower than in the rest of the UK, with the coldest ever UK temperature of -27.2 °C (-16.96 °F) recorded at Braemar in the Grampian Mountains, on 11 February 1895. Winter maximums average 6 °C (42.8 °F) in the lowlands, with summer maximums averaging 18 °C (64.4 °F). The highest temperature recorded was 32.9 °C (91.22 °F) at Greycrook, Scottish Borders on 9 August 2003.

In general, the west of Scotland is usually warmer than the east, owing to the influence of Atlantic ocean currents and the colder surface temperatures of the North Sea. Tiree, in the Inner Hebrides, is one of the sunniest places in the country: it had 300 days of sunshine in 1975. Rainfall varies widely across Scotland. The western highlands of Scotland are the wettest place, with annual rainfall exceeding 3,000 mm (118.1 in). In comparison, much of lowland Scotland receives less than 800 mm (31.5 in) annually. Heavy snowfall is not common in the lowlands, but becomes more common with altitude. Braemar experiences an average of 59 snow days per year, while coastal areas have an average of fewer than 10 days.

Scotland has five main international airports (Glasgow International, Edinburgh, Aberdeen, Glasgow Prestwick and Inverness) which together serve 150 international destinations with a wide variety of scheduled and chartered flights. BAA operates three airports, (Edinburgh, Glasgow and Aberdeen), and Highland and Islands Airports operates 11 regional airports, (including Inverness), which serve the more remote locations of Scotland. Infratil operates Glasgow Prestwick.

The Scottish motorways and major trunk roads are managed by Transport Scotland. The rest of the road network is managed by the Scottish local authorities in each of their areas.

Regular ferry services operate between the Scottish mainland and island communities. These services are mostly run by Caledonian MacBrayne, but some are operated by local councils. Other ferry routes, served by multiple companies, connect to Northern Ireland, Belgium, Norway, the Faroe Islands and also Iceland.