Blaenau Gwent tops the ranking, with 330 m metres above sea level on average, ahead of Merthyr Tydfil and Caerphilly. The full ranking is below, each entry linked to its page.

# County Avg elevation
1 Blaenau Gwent 330 m
2 Merthyr Tydfil 233 m
3 Caerphilly 197 m
4 Powys 197 m
5 Torfaen 188 m
6 Scottish Borders 181 m
7 South Lanarkshire 178 m
8 Midlothian 169 m
9 Rhondda Cynon Taf 166 m
10 Derbyshire 155 m
11 West Lothian 144 m
12 West Yorkshire 143 m
13 Denbighshire 142 m
14 County Durham 141 m
15 Staffordshire 139 m
16 West Midlands 133 m
17 Flintshire 131 m
18 Shropshire 131 m
19 Ceredigion 129 m
20 Conwy 129 m
21 East Ayrshire 129 m
22 North Lanarkshire 126 m
23 Perth and Kinross 119 m
24 Devon 117 m
25 Angus 115 m
26 Greater Manchester 115 m
27 Aberdeenshire 112 m
28 Wrexham 112 m
29 Herefordshire 110 m
30 Buckinghamshire 109 m
31 Gwynedd 109 m
32 Monmouthshire 108 m
33 Neath Port Talbot 108 m
34 Northumberland 106 m
35 Wiltshire 106 m
36 South Yorkshire 104 m
37 Leicestershire 103 m
38 Cumbria 102 m
39 Carmarthenshire 101 m
40 Hertfordshire 101 m
41 North Yorkshire 101 m
42 Northamptonshire 101 m
43 Oxfordshire 99 m
44 Bridgend 98 m
45 Cornwall 98 m
46 Gloucestershire 98 m
47 Warwickshire 96 m
48 Rutland 94 m
49 Lancashire 92 m
50 East Renfrewshire 91 m
51 Moray 91 m
52 Berkshire 83 m
53 Somerset 79 m
54 Surrey 76 m
55 Worcestershire 75 m
56 Bedfordshire 73 m
57 Pembrokeshire 73 m
58 Dorset 72 m
59 Hampshire 71 m
60 Highland 71 m
61 Dumfries and Galloway 70 m
62 Stirling 70 m
63 City of Edinburgh 69 m
64 Fife 69 m
65 Swansea 66 m
66 Tyne and Wear 66 m
67 Cheshire 65 m
68 Inverclyde 65 m
69 Aberdeen City 64 m
70 East Sussex 63 m
71 Kent 63 m
72 East Dunbartonshire 61 m
73 Falkirk 59 m
74 Essex 58 m
75 East Lothian 56 m
76 Dundee City 51 m
77 Nottinghamshire 51 m
78 The Vale of Glamorgan 51 m
79 Clackmannanshire 49 m
80 Bristol 48 m
81 North Ayrshire 47 m
82 Suffolk 47 m
83 West Sussex 47 m
84 Isle of Anglesey 45 m
85 South Ayrshire 45 m
86 Glasgow City 43 m
87 Greater London 43 m
88 Cardiff 40 m
89 Isle of Wight 38 m
90 Argyll and Bute 37 m
91 Newport 37 m
92 Merseyside 36 m
93 West Dunbartonshire 34 m
94 Norfolk 30 m
95 Renfrewshire 30 m
96 Cambridgeshire 28 m
97 Shetland Islands 27 m
98 Lincolnshire 26 m
99 Orkney Islands 26 m
100 Na h-Eileanan an Iar 24 m
101 East Riding of Yorkshire 21 m
102 Isles of Scilly 7 m

Source: Ordnance Survey terrain data. Compiled by Postcodes UK.

Frequently asked questions

Which is the highest county in Britain?

Blaenau Gwent tops the list, with 330 m metres above sea level on average, followed by Merthyr Tydfil and Caerphilly.

How is this ranking measured?

This ranking is based on Ordnance Survey terrain data. It covers the ceremonial counties of England and the council and principal areas of Scotland and Wales.