Evidence-backed unusual places in Guernsey, grouped with maps, original sources and useful geographic context. These are crawlable research records, not an indiscriminate directory: reports without enough depth remain available for exploration but are excluded from search indexing.
The reef that became a cliff-top plateau
Pleinmont, Torteval, Guernsey
A high, surprisingly level headland records an ancient marine erosion surface that local geological interpretation describes as a largely submerged warm-water reef around 10 million years ag
Map, evidence and context →Odd boundaries · States of GuernseyAn island joined by the tide
Lihou, Guernsey
A causeway alternates between road and seabed according to the tide.
Map, evidence and context →
TIDAL ISLAND · Expanded physical odditiesLihou
Guernsey
small island, part of the Bailiwick of Guernsey, Channel Islands
Map, evidence and context →