Shetland Islands, Orkney Islands, Hebrides, Isle of Man.
Channel Islands: Jersey, Guernsey.
North Channel, Irish Sea, Saint George's Channel, English Channel, Strait of Dover, Bristol Channel.
Rivers: Thames, Severn, Shannon.
Mountains: Ben Nevis.
Cities: Aberdeen, Edinburgh, Glasgow, Newcastle, Leeds, Manchester, Sheffield, Liverpool, Birmingham, Cardiff, Bristol, Plymouth, Southampton, Dover, London, Dublin, Limerick, Cork, Belfast, Londonderry.
A blank map of the British Isles, courtesy of D-Maps.com, can be found here.
Image courtesy Wikimedia Commons.