"extends on" is a correct and usable phrase in written English.
It is typically used when talking about something that continues or is extended in duration or area. For example, "The river extends on for miles".
The property extends on to an elevated terrace overlooking Fistral beach.
Who knows how much of that is true and how far the scope extends on their newly imposed jurisdictions, but we do know that those are one set of protestors you do NOT want outside your venue.
Mr. Okotie's empire extends on a block formerly named after the National Bank.
The plaza that extends on both sides is lined with relief sculptures of wildlife.
I would be pleased to discuss in negotiations how far plain time working extends on Saturdays".
For Mr. Bel, who has created acclaimed theatrical portraits of dancers like Véronique Doisneau and Cédric Andrieux, "Disabled Theater" extends on his study of people and their bodies.
The region is not exactly coextensive with the present-day nomós (department) of Arkadía, which extends on the east to the Gulf of Argolís (Argolikós Kólpos).
That provision allows the Treasury, in certain circumstances, to provide up to $1.5 billion in loans to Farmer Mac to support the guarantees the company extends on farm loans.
Similarly, the settlement's outpost, Havat Ma'on, which is illegal even according to Israeli law, is not only built without permission, but also extends on to private Palestinian land, with all the resulting hardships on the local Palestinians that such encroachment brings.
The basin of the Loukkos river extends on an area of 3750 km2.
The passive zone extends on a wide range of potentials with significant drop in current density (Fig. 1).
