Passage 9.38.6
σταδίους δὲ ἀφέστηκεν ἑπτὰ Ὀρχομενοῦ ναός τε Ἡρακλέους καὶ ἄγαλμα οὐ μέγα. ἐνταῦθα τοῦ ποταμοῦ τοῦ Μέλανός εἰσιν αἱ πηγαί, καὶ ὁ Μέλας ἐς λίμνην καὶ οὗτος τὴν Κηφισίδα ἐκδίδωσιν. ἐπέχει μὲν δὴ καὶ ἄλλως τῆς Ὀρχομενίας τὸ πολὺ ἡ λίμνη, χειμῶνος δὲ ὥρᾳ νότου τὰ πλείω πνεύσαντος ἔπεισιν ἐπὶ πλέον τῆς χώρας τὸ ὕδωρ.
Seven stades distant from Orchomenos is a temple of Heracles containing a statue that is not large. Here are the sources of the river Melas, which itself also flows into Lake Cephisida. The lake ordinarily covers much of the territory of Orchomenos, but in the winter season when the south wind blows more strongly, the water spreads out even further over the country.