Green Holm tunnel (W entrance)

Western entrance passage reportedly runs ~S and intersects a tunnel running to the NE & connecting to the eastern entrance. Overall length ~30 m based on GIS. [N & S Thomson in Report 1145]

Notes: The length is calculated from the Report 1145 entrance coordinates and the directions given for the tunnels. This west tunnel, which runs south, comes out at 24 m.

Links and Resources:

Current OS has 'Natural Arch' (often meaning a sea cave in the islands) and a tunnel outline corresponding to the one from The W entrance (Report 1145) - see below for scan.
Pastmap Aerial marked up to show the cave entrance locations (NS57(E & W)) on E end of Green Holm. The gloup location is also indicated.
Photo 1 an aerial photo, looking north, shows Green Holm at the bottom. The gloup is clearly visible - or is it a geo ?
Pastmap current OS, a high resolution layer. On the left, on Green Holm, 'Natural Arch' and a tunnel outline running S from the W entrance to a large, partly subtidal gloup.
Map 9 from p149 of FI Caves (GSG version), annexe to Report 1145. This cave system NS57(E) & (W) is towards the top right (NE) of Green Holm.
Rpt 1145 Harries, D.B., Purcell, A., Moore, C.G., Lyndon A.R., Porter, J.S., Saunders, G.R. and Hume, C.L. 2024. Distribution mapping and baseline monitoring survey of sea caves around Fair Isle. NatureScot Research Report 1145.

This entry was last updated: 2026-01-01 19:51:03

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NGR:	HZ 19550 70191
WGS84:	59.51723, -1.65630
Length:	55 m
Vert. Range:	Not recorded
Altitude:	-1 m
Geology:	Ward Hill Sandstone Formation-dolomitic argillaceous rock
Tags:	none
Registry:	main

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