Is The Sea On Maps At High Or Low Tide?

Question

When maps are being drawn is the boundary between land and sea taken at the high or low tide mark?

Edward, Finchley 

Answer

**DEFINITIVE**

Name: Rob, Treorchy

Qualification: Metal detectorist who visits a lot of beaches

Answer: For the purpose of determining who owns what is discovered on beaches they use the average mid-point, so arguably the same principle could be applied to maps.