Stanhope, John Spencer: Olympia or topography illustrative of the actual state of the plain of Olympia and of the ruins of the city of Elis (London, 1824)

DESCRIPTION OF OLYMPIA.

The Plain of Olympia is situated on the right bank of the Alpheus,
now known by the name of Rufco, which, from the extent of its bed,
and the rapidity of its course, may still be considered one of the finest
rivers in Greece. It is of a milky colour; and, during our residence in
Olympia, we perceived a considerable diminution in the body of its waters.
The banks are steep, and its course having frequently been changed, its
appearance is diversified by several islands covered with shrubs. A chain
of mountains, that rise immediately from the southern bank of the Alpheus,
terminates the valley in that direction, though the river itself forms the
southern boundary of the plain. To the north it is bounded by another
cbain, in which Mount Saturn (Chronios) appears conspicuous. A conical
hill rising near the northern bank, and running almost at right angles with
the northern range, may be considered as its eastern boundary; whilst on the
opposite side, a river, supposed to be the Cladcus, marks out its western
termination.

The only valley of any importance in the northern range, is that called
by M. Fattvel, Aiulilalo, or the Echo, (perhaps more properly Antilalo),