Are Jewish towns in Judea and Samaria built on Arab land?

One of the many claims in the mainstream media that is taken for granted is that Jewish towns in Judea and Samaria are built on Arab land. That claim, write Rachel Neuwirth and John Landau, is patently false (Hat Tip: Sunlight).

Not even the so-called “unauthorized” or “illegal” Jewish
settlements, those that the Israeli government has not fully and
expressly authorized, are built on