Back Лонданскі басейн Byelorussian Лондонски басейн Bulgarian London Basin CEB Londoni nõgu Estonian Bassin de Londres French Londoni-medence Hungarian Bacino di Londra Italian Londonbassenget NN Londonbassenget NB Basen Londyński Polish
The London Basin is an elongated, roughly triangular sedimentary basin approximately 250 kilometres (160 mi) long which underlies London and a large area of south east England, south eastern East Anglia and the adjacent North Sea. The basin formed as a result of compressional tectonics related to the Alpine orogeny during the Palaeogene period and was mainly active between 40 and 60 million years ago.