Scapa Flow is in the Orkney Islands in Scotland at the most northern tip of the UK. There are eight main ship wrecks to dive that remain from the scuttled German fleet. The dive depths range from about 12 metres (40 feet) to about 45 metres (150 feet). The waters are the warmest in September where they rise to 14C (57F), but go down to 4C (39F) in April. Visibility can be as good as 30 metres (100 feet), but also drop to around 10 metres (33 feet). Which in UK terms is very good visibility. Dive boats are boarded at a place called Stromness on Orkney mainland.