I found this report from 2000 which addresses exactly this point.
http://jncc.defra.gov.uk/pdf/tyldesley_reportall.pdf It still doesn't answer the question "why Dittisham" though. According to one algorithm it should cross the river at the tidal limit, which is in Totnes, far above Dittisham. That would be even sillier. The boundary cuts straight across Torbay from Torquay to Brixham - but this is as defined in a specific law. The City of Bristol's administrative boundaries are even sillier. In any case, the coastline (which is a matter of geographical fact, although you can argue about whether it's HWM/LWM etc) is not the same as the limit of (governmental) jurisdiction and the Extent of the Realm; if they are not colinear, there should be two lines in OSM, right? Colin On 2013-01-30 11:46, Jason Woollacott wrote: > I wish I knew the reasoning behind it... I can understand the boundary > being at the low water mark, but it seems very odd just to draw it across > at Dittisham. > > Jason
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