The mud in the Stymphalos area around the lake is very high in clay and makes a good mortar as a result.
(The mud in the Stymphalos area around the lake; is; very high in clay) (The mud in the Stymphalos area around the lake; makes; a good mortar; as a result)
The mud in the Stymphalos area around the lake The mud in the Stymphalos area around the lake
is makes
very high in clay
a good mortar as a result