 
<translate> Nkebi ahịrịokwu dị mkpa n'amaokwu ahụ bụ: Na UK, Ordnance Datum (elu mita 0 na map UK) bụ ọkwa oke osimiri dị na Newlyn na Cornwall n'etiti afọ 1915 na 1921. Ya mere azịza ya bụ Newlyn na Cornwall n'agbata afọ 1915 na 1921. <eng> The relevant sentence in the passage is: In the UK, the Ordnance Datum (the 0 metres height on UK maps) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. So the answer is Newlyn in Cornwall between 1915 and 1921. 