However, since the formation of the Zuiderzee and obstruction from the Afsluitdijk, the IJssel no longer flows into its estuary, the Vlie, now restricted in meaning and referring only to the strait separating the islands of Vlieland (itself named after the Vlie strait) and Terschelling.
He preached the Gospel among the tribes of the district, and erected a little chapel at Wilp (see: Voorst) (Wilpa) on the west bank of the IJssel.
The most important of these waterways is of course river IJssel; others include the Zwarte Water and (Overijsselse) Vecht rivers; the Regge stream, which flows through Twente to spend its last few kilometers in Salland before ending in the Vecht near Ommen; the Schipbeek stream; and the Soestwetering stream, which merges with a number of lesser streams near Zwolle to form river Zwarte Water.
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The region is most likely named after the river IJssel, anciently known as Isala, and the lakeland Sallzee at the confluence of the rivers Vecht and IJssel.
In 1285 Floris V, Count of Holland dammed the Hollandse IJssel connection between the Lek and the Hollandse IJssel.