Neßmersiel belongs to the municipality Dornum in Aurich in Lower Saxony, Germany. Neßmersiel is about 5 kilometres northwest of Dornum. From 1867 to 1977, Neßmersiel belonged to Norden (Altkreis Norden).
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53°40′N 7°21′E / 53.667°N 7.350°E / 53.667; 7.350