Now -- is "a little ways above the Moeris" -- to the north? ...or to the south -- UPstream on the Nile?
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Wooops! I just did a Google Earth search for "Black Pyramid, Egypt". It's ~21 miles NE of the north edge of the Moeris depression -- but there are definitely large, complex structure remains between the pyramid remnants and the Nile valley escarpment! Be back when I've done some image post-processing...
TXnMA