Passage 8.54.1
Λακεδαιμονίοις δὲ καὶ Τεγεάταις ὅροι τῆς γῆς ὁ ποταμός ἐστιν ὁ Ἀλφειός. τούτου τὸ ὕδωρ ἄρχεται μὲν ἐν Φυλάκῃ, κάτεισι δὲ οὐ πόρρω τῆς πηγῆς καὶ ἄλλο ὕδωρ ἐς αὐτὸν ἀπὸ πηγῶν μεγέθει μὲν οὐ μεγάλων, πλεόνων δὲ ἀριθμόν· καὶ διὰ τοῦτο τῷ χωρίῳ Σύμβολα γέγονεν ὄνομα.
The boundary of the land between the Lacedaemonians and the Tegeans is the river Alpheios. Its water arises at Phylake, and not far from its source it receives additional water flowing into it from a number of springs, small in size but greater in number; for this reason, the place has come to be named Symbola ("Meeting-places").