The trench system on the Western Front in World War I—fixed from the winter of 1914 to the spring of 1918—eventually stretched from the North Sea coast of Belgium southward through France, with a bulge outwards to contain the much-contested Ypres salient.
30S 90E = None of the above. It's in the Indian Ocean (They could have meant 30S 90W. That's in the Pacific Ocean, which is on the list but hasn't been used).
